I wouldn't put it past Mueller to send a report to Congress accusing Trump of obstruction of justice for the firing of Comey, his buddy. Zero evidence unless he counts Trump being aware of his son's meeting with a Russian lawyer as proof that Trump wanted the investigation to end. Then it would be up to Trump's enemies in Congress what to do next.
That’s the ticket.
Investigate Trump for wanting the investigation of Trump to end, then find him guilty of not cooperating with the investigation to stop the investigation. Then Maxine Waters can demand immediate impeachment, the mainstream media will proclaim “this is the last straw,” John McCain will offer to be the replacement President and Paul Ryan will nod his head sadly and say he’s given President Trump every chance to work with Congress, but they just can’t seem to get anything done, so regrettably he and the rest of the Republicans must join Maxine in righting the horrible wrong that’s been done to our country.
Then they can get to work tearing down statues of George Washington and banning bananas, just in case some snowflake is offended somewhere.