I am hearing so so many Dems, and at least one of our leading candidates for 2020, saying that “we need to hear from Mueller”. Guess what, you already heard from Mueller. What do you expect him to say if you bring him before you: “Oh, yeah, I left out a lot of really really bad stuff, like the phone call with Putin where Trump promised to sell him Texas.” WTF? Do you expect to get anything more than you have now? Why? He is a straight shooter who will constantly refer you to the report or defer to the DOJ.
You know you already have plenty to begin impeachment proceedings. There are all the topics covered by Mueller that include the crimes of obstruction of justice (numerous counts), as well as the traitorous behavior with Russia and Wikileaks. There is the child abuse at the border. There are numerous emoluments issues. There are the security clearances for his children. And on and on and on.
Pick you top 10 and start the proceedings for impeachment. Have strong witnesses and lay out how this is damaging to the nation and should concern ALL Americans. And if the Senate Repubs vote to acquit, hang in around their necks like a dead albatross.