"Why don't I just fire Mueller?" Trump said when asked by a reporter. "Well, I think it's a disgrace what's going on - we'll see what happens."
"Many people have said you should fire him," the President added.
Flanked by top aides and senior military advisers, the President also raised the investigation of former Secretary of State Hillary Clinton over her personal email server, again making the case that she should have received much more scrutiny for that matter than what he has received over the 2016 election.
"There are crimes - and those crimes are obvious," the President said of the Clinton emails. "Lies, under oath, all over the place."
"33,000 emails were deleted after getting a subpoena from Congress. And nobody bothers looking at that," the President continued, again making it clear that he sees the Russia investigation as patently unfair.
"When I saw this, when I heard about it, that is a whole new level of unfairness," the President added.
The President's words about Mueller worried Democrats, who again warned Mr. Trump not to fire Mueller, a former FBI Director first appointed by President George W. Bush in 2001.
"The need for Congress to protect Mueller's investigation has never been more clear," said Sen. Cory Booker (D-NJ).
"President Trump’s continued attempts to obstruct this investigation must stop," said Sen. Bob Casey (D-PA).