I got a chuckle out of  letter writer Tom Sabel's 2nd to last paragraph:

"The Dems have no control over any branch of government, so how can they be obstructing? The fact is, if Hillary Clinton was president now and hired Michael Flynn while he was under investigation, or gave the Russians classified information, or fired the FBI director investigating her, impeachment proceedings would already be happening."

1.) The Dems are able to obstruct because the Senate is split 52 - 48 and the Republicans would need 60 votes to override a filibuster on legislation. The filibuster was only nixed for judicial nominees after much obstruction by Democrats over Neil Gorsuch.

2.) If Hillary Clinton were president and facing the accusations Trump is, the media would either be looking the other way or defending her instead of piling on like they are with Trump.