To the debate, and to those who consistently accuse others _"You do not know your stuff" as an arbiter of what is accurate or not
What does the Constitution define as  an impeachable offense?
Impeachable offenses
The  Constitution defines impeachment at the federal level and limits  impeachment to "The President, Vice President, and all civil officers of  the United States" who may be impeached and removed only for "treason,  bribery, or other high crimes and misdemeanors".
[32] Several commentators have suggested that 
Congress alone may decide for itself what constitutes a "high crime or misdemeanor", especially since 
Nixon v. United States stated that the Supreme Court did not have the authority to determine whether the Senate properly "tried" a defendant.
[33] In 1970, then-
House Minority Leader Gerald R. Ford  defined the criterion as he saw it: "An impeachable offense is whatever  a majority of the House of Representatives considers it to be at a  given moment in history."
[34]
Jefferson's Manual, which is integral to the Rules of the House of Representatives,
[39]  states that impeachment is set in motion by charges made on the floor,  charges proferred by a memorial, a member's resolution referred to a  committee, a message from the president, or from facts developed and  reported by an investigating committee of the House. It further states  that a proposition to impeach is a question of high privilege in the  House and at once supersedes business otherwise in order under the rules  governing the order of business. 
Process
At the federal level, the impeachment process is a two-step procedure. The 
House of Representatives  must first pass, by a simple majority of those present and voting,  articles of impeachment, which constitute the formal allegation or  allegations. Upon passage, the defendant has been "impeached". Next, the  
Senate tries the accused. In the case of the impeachment of a president, the 
Chief Justice of the United States  presides over the proceedings. For the impeachment of any other  official, the Constitution is silent on who shall preside, suggesting  that this role falls to the Senate's usual presiding officer, the  President of the Senate who is also the 
Vice President of the United States. 
In theory at least, as President of the Senate, the 
Vice President of the United States  could preside over their own impeachment, although legal theories  suggest that allowing a defendant to be the judge in their own case  would be a blatant 
conflict of interest. If the Vice President did not preside over an impeachment (of anyone besides the President), the duties would fall to the 
President pro tempore of the Senate. 
To convict an accused, "the concurrence of two thirds of the members present" is required.
[31]  Conviction removes the defendant from office. Following conviction, the  Senate may vote to further punish the individual by barring him or her  from holding future federal office, elected or appointed. Conviction by  the Senate does not bar criminal prosecution. Even after an accused has  left office, it is possible to disqualify the person from future office  or from certain emoluments of his prior office (such as a pension). If  there is no charge for which a 
two-thirds majority of the senators present vote "guilty", the defendant is acquitted and no punishment is imposed. 
So what exactly counts as an impeachable offense?
https://www.washingtonpost.com/news/...=.b77ec2e42834
A very nice article from WAPO on the topic.  It may be that an impeachable offense is whatever the House will vote a 2/3 majority to impeach an official.  Which, in the Case of the DPST v President Trump  - is that Trump is President and breathing. From the article" When a federal official is destabilizing established norms of  conduct, Congress may impeach to send a strong signal that such behavior  must not become the new normal."  Thus a new Congresswoman may be well within her right to "Impeach the M--F...r"   This, now, is the new normal for DPST conduct and is not impeachable in her case for violation of behavioral norms in the House and Senate for DPST's.
The  U.S. Constitution’s provision that federal officers are impeachable for  “high crimes and misdemeanors” is notoriously unclear. That’s on  purpose. The framers wanted a fairly open-ended tool for removing an  officer who posed a serious and immediate threat to the constitutional  order. The impeachment power needed to be flexible enough to deal with  circumstances that could not be easily foreseen.
 Since impeachments are fundamentally 
political in nature,  concerns that are critical in criminal law — for instance, ensuring  that citizens know in advance what might be punishable, or preventing  judges from arbitrarily imposing sanctions — don’t apply here. In the  founders’ judgment, members of Congress would need the authority to  assess, in context, whether an individual officer needed to be removed.
 This  does not mean that just anything should be regarded as an impeachable  offense. The framers — and following them, members of Congress — have  been very reluctant to use impeachment for ordinary political  disagreements. Under democratic norms, even egregious policy  disagreements or errors of judgment should be corrected through routine  constitutional checks and balances if at all possible. For instance, if  the president were to launch military strikes that Congress thought  imprudent, it has other tools to affect policy. If the president were to  direct executive branch officials to perform unconstitutional actions,  the courts have the power to correct them. If the president is not  especially competent, the people can replace him at the next election.
  
 
 What’s  more, just because a constitutional officer has committed an  impeachable offense does not mean Congress is required to impeach. An  impeachable offense is a necessary but not sufficient justification for  impeaching and removing an officer. Some bad acts can be tolerated. Some  call for less drastic responses than the extreme measure of  impeachment, and so Congress has frequently tried other methods of  reining in bad conduct before looking into impeachment. Congress has  felt a particularly heavy responsibility to pursue other options before  attempting to remove an elected official.
 Defendants in  impeachment trials often suggest that only criminal acts are impeachable  offenses. Congress has never found this very persuasive. Indeed, the  search for criminal offenses can largely miss the point. The ordinary  courts are the proper forum for proving and punishing criminal offenses.  If the Senate convicts an officer who has been impeached, it can choose  from only two penalties: removal from office and disqualification from  future federal office. Impeachment solves a political problem, not a  legal one; it responds to threats to the constitutional order, not the  civil order.
  
 
 It’s  true that criminal acts could be a reason to impeach. An officer  imprisoned after being convicted of a crime may, obviously, have trouble  performing duties, requiring impeachment and removal. Some criminal  offenses might be seen as disqualifying an officer from performing  public duties. The two examples mentioned in the Constitution’s text —  treason and bribery — are obvious breaches of public trust. Federal  judges accused or convicted of corruption of various kinds may no longer  give the public confidence that the courts are fair. President Bill  Clinton’s critics argued that presidential perjury was inconsistent with  the dignity of the chief executive officer, as President Richard  Nixon’s critics had argued about obstruction of justice.
    
 However,  it’s easy to imagine criminal offenses that do not suggest an  individual could no longer effectively conduct the office’s  responsibilities, and so would not necessitate impeachment and removal.  If, for instance, President Trump were found to have committed a  criminal offense during his past business dealings or was charged with  impaired driving while on a golf weekend in Florida, it seems unlikely  that an impeachment would be a necessary or useful response.
 At  the same time, actions that are not criminal might be impeachable. An  officer who escaped prosecution or conviction on criminal charges of  bribery might have forfeited the public trust — and be subject to  impeachment.
 Even actions that might never be crimes could be impeachable. The very first impeachment charged that 
Judge John Pickering  “did appear upon the bench of said court, for the purpose of  administering justice, in a state of total intoxication” and did from  the bench “in a most profane and indecent manner, invoke the name of the  Supreme Being, to the evil example of all the good citizens of the  United States.” Judge West Humphreys was impeached in 1862 for  abandoning his judicial duties in district in Tennessee and joining the  Confederacy. The articles of impeachment laid against him also included  giving a public speech in favor of secession and unlawfully acting as a  judge for the Confederacy. In 1933, Judge Halsted Ritter’s impeachment  included the charge that he had continued to practice law in a manner  “calculated to bring his office into disrepute,” violating judicial  ethics. Associate Justice Samuel Chase was charged with abusive behavior  from the bench, and President Andrew Johnson was charged with firing  the Secretary of War in a manner inconsistent with a federal statute.
  
 
 
Many impeachment efforts  have been prompted by behavior seen as inconsistent with the  responsibility and reputation of the office. Some individuals are  impeached to get them out of office, when their actions threaten the  political system’s functioning, and they can’t be stopped any other way.
 Impeachments  also serve a broader function. Congress can use it to reinforce or  create new political norms. Even when the impeached official is not  convicted and removed from office, the impeachment itself sends others  the message that those actions were unacceptable and must not be  repeated. When a federal official is destabilizing established norms of  conduct, Congress may impeach to send a strong signal that such behavior  must not become the new normal.
 Even lawful actions, or actions  within an officer’s authority, can be impeachable offenses. Context is  everything. Actions that are ordinary and inoffensive in some  circumstances can be extraordinary and threatening in others.  Impeachment is not merely for illegal or constitutional actions. It is  also a remedy for dereliction of duty and abuse of power.
 Evaluating  those circumstances and assessing the meaning of actions requires  political judgment. That’s why legislatures, not judges, are entrusted  with impeaching. The people’s representatives in Congress are the ones  who must make the case, to their colleagues and to the people  themselves, that an officer’s actions are so far beyond the pale and so  threatening that impeachment is the only proper response.
 
Keith  E. Whittington is the William Nelson Cromwell Professor of Politics at  Princeton University. 
It is clear that the House DPST's will and already have forwarded motions to Impeach Trump.  Getting the simple House majority to impeach  is doable  for Pelosi and her DPST.  Getting a Senate 2/3 majority vote to convict is another matter.  Since , evidently, a motion to impeach takes precedence on the House Floor- I am glad the nitwits are tying themselves up chasing their tails - keeps them out of further mischief. 
Those read, retain, and apply this information will have some reasonable knowledge of the impeachment process as defined by the Constitution.