Now you are talking about something different than before. If this is what you meant, that certainly was not clear from what you previously wrote. I've not heard any Senators propose to do what you suggest. But even if they did, it is within the lawful power of the Senate to make the rules that govern its proceedings. Voting to do that is not a crime, and certainly not treason. Again, it's not levying war against the U.S. nor giving aid and comfort our enemies. Your very strong dislike for Trump are coloring your views on this. You are determined to see this as a crime as a result.
Personally, I think that as things stand today, if the house were to impeach, the Senate would not have the votes to remove Trump from office even without any change in the rules. And the Democrats would pay the price for being seen as trying to subvert the democratic process, much as the Republicans did in their efforts to impeach both Clinton and Obama. As previous impeachment efforts have shown, it is only likely to succeed when there is a strong popular consensus that the guy has committed some serious offense and has to go. The public was nearing that point with Nixon in 1974. Had he not resigned, he may have been successfully removed from office. But to get to that point, the Congress had held a series of public hearings that put on display the misdeeds of the president and his minions in covering up the Watergate break-in. The Democrats today have not yet got that strong popular consensus that they'll need. They are going to have to convince not just Democrats but a large number of Republicans as well. Even then, impeachment is likely to instill further division in the country. IMO the best way to get rid of Trump is by voting him out at the next election. Americans tend to accept better the results at the ballot box than they would an impeachment process that appears to be partisan driven.

