Mueller was not able to fully clear Trump of obstruction of justice and that seems to be what Democrats want answers to from Mueller.
Attorney General William Barr will have the final say on whether Special Counsel Robert Mueller will testify before Congress about his report on the Russia investigation, President Trump said Thursday.
“I’m going to leave that up to our very great attorney general,” Trump told reporters, according to Roll Call. “He’ll make a decision on that.”
Barr -- who has said he doesn't object to Mueller testifying -- has authority to block Mueller from appearing before Congress because the special counsel is a Justice Department employee.
Congressional Democrats have pushed for Barr to release the unredacted version of Mueller's 400-page report, to no avail. House Speaker Nancy Pelosi, D-Calif., and House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., have said the actions of Trump and Barr amount to a "constitutional crisis."