Brilliant comment very few get it.
If Trump is forced to testify he should take the Fifth. He has the perfect legitimate reason to take the Fifth, because the intereview is obviously an attempt to trick him into committing “perjury”, by finding some statement which conflicts with someone else’s statement. They have hundreds of hours of interviews with other people. There is no way that 40+ people in hundreds of hours of statements will remember and describe everything exactly the same. They will take ambiguous words about subjective things like state of mind and intent, faulty memories of dates and times and conversations, and they could prosecute any of the 40+ people for perjury (not that they would win but they could charge them). So Trump should take the Fifth so he will not incriminate himself with regard to the crime of perjury. Lois Lerner did this and she walks free as a bird. The only downside is political, but since it is a perjury trap, why not take the political risk? Dems can then say blah blah he took the fifth so there must be collusion, but they can’t prove the collusion so they will be left with perjury as the only option, and Trump hasn’t said a damn thing to them so they lose and he wins in 2020.