A president commits obstruction of justice and possible treason and a congress who will do nothing about it - that is ABSOLUTELY a Constitutional crisis. 

Checks and balances do absolutely no good when branches ignore their Constitutional duty. Last night at a town hall, Rep. Tom MacArthur - of the MacArthur amendment of that disastrous health bill - told attendees that it is not congress' job to oversee the White House.

Actually it is. The Constitution even states so.

Also last night, House GOP Leader Kevin McCarthy stated that "congress serves at the pleasure of the president."
Again - another Republican who has never read the Constitution

And let's not kid ourselves - if Trump could execute people, he would do so in a heartbeat.