This evening, via Twitter, from Senator Claire McCaskill (D):

Claire McCaskill‏ @clairecmc
It is a very bad idea to appoint a politician to head the FBI right now. We need a law enforcement professional. #bipartisan support.
9:22 PM – 18 May 2017

A couple of the responses:

Well if it’s a bad idea – you can be sure that Trump will do it…

Especially a politician that is a partner at the law firm that represents the president!

In 2008 John McCain (r) made a choice between Joe Lieberman and Sarah Palin. That’s all you need to know.