In private conversations on Capitol Hill, Trump is often not taken seriously.

Some Republican lawmakers consider some of his promises — such as making Mexico pay for a new border wall — fantastical. They are exhausted and at times exasperated by his hopscotching from one subject to the next, chronicled in his pithy and provocative tweets. They are quick to point out how little command he demonstrates of policy. And they have come to regard some of his threats as empty, concluding that crossing the president poses little danger.

https://www.washingtonpost.com/politics/whos-afraid-of-trump-not-enough-republicans--at-least-for-now/2017/06/27/cee56720-5b57-11e7-9b7d-14576dc0f39d_story.html?utm_term=.fd93bfcaced5