He absolutely should block all attempts at this point. You can't just go "fishing for crimes" because you don't like someone.
FOUR separate, non-partisan inquiries have ALL determined there were no crimes committed by President Trump and his campaign as it relates to the 2016 election, NO Collusion, and NO Obstruction.
But continue as they may, these Democrats are further alienating the undecided with their ridiculous shenanigans. The American people are exhausted from this continual barrage and assault of a their duly elected President.
This will all backfire, and cause the Democrats to not only lose the 2020 election, but also lose the House and lose more seats in the Senate.
“The truth is incontrovertible, malice may attack it, ignorance may deride it, but in the end; there it is.”