I have often seen the question asked "what law has trump broken?" For those with that question here is the relevant info:
The founders of the United States feared presidents abusing their powers, so they included in the Constitution a process for removing one from office.
The president, under the Constitution, can be removed from office for "Treason, Bribery, or other high Crimes and Misdemeanors."
High crimes and misdemeanors have historically encompassed corruption and abuses of the public trust, as opposed to indictable violations of criminal statutes.
So, impeachable violations and crimes are not necessarily the same thing. Hope that helps those that think (incorrectly) that a crime has to be broken for impeachment to fairly take place.