holds some responsibility, but adding, congress would be opening itself to a dangerous standard of using impeachment as a tool for political revenge against a private citizen. >> there is no constitutional provision permitting the impeachment for thsole purpose of removing them from running for office in the future of somebody who is no longer president, who is a citizen. >> reporter: rob portman of ohio saying he won't seek re-election next year, siting the toxic political climate in washington. asked whether his decision will influence his vote on impeachment -- >> i am going to consider, among other things, what's best for our country. how to help heal our country. >> overnight majority leader chuck schumer saying the former president must be held accountable. >> his act on the 6th was the most despicable thing any president has ever done and he is the worst president ever. and you cannot just, let's move on. >> reporter: so the preparations begin now. most of the details of the...