E. J. Dionne has a nice proposal. First, agree that Trump is unfit to be President. Second, have his attorney general "immediately recuse himself from all decisions about all aspects of the Russia investigation by the FBI and the intelligence services."
I was way more interested in "Donald Trump is unfit for the office" arguments before the election. This isn't a proposal for an investigation, it's a proposal for Republicans to take the brakes off the deep state. But if Jeff Sessions is unfit to exercise his office, surely so is everyone else in the administration. What's left? Impeachment based on Trump's performance at press conferences or in writing executive orders that he's apparently fine with having courts review? For Trump and his team to resign and... what? Paul Ryan to be President? Or does he need to resign too? Or should we just dispense with having a President, and leave "the FBI and the intelligence services" to determine what is right, with of course the informative blessings of the 9th Circuit Court?
Does anyone else have a more serious proposal?