He is not the President any longer and is not answerable to the Senate.
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I disagree. He IS the president. He did win the election, did he not? The fact that millions of votes were illegally moved from his column to Biden‘s does not matter. The fact the Democrats held a sham inauguration also does not matter. See tagline. President Trump is a president in exile and the Senate knows it. That is why they are trying to legally remove him from office.
Trump will not appear in any Sinate trial.
Consider that his current whereabouts are unknown to the black hats. *IF* he was really at Mara Lago, there would be an FAA TFR there (See my FR name, I'm aware of pending and current TFRs in the US). The pic the other day with McCarthy is not evidence of any sort to the contrary.
Trump currently is under the protection of the DOD, probably kept very safe in an underground bunker/SCIF. Any appearance in the Sinate would be giving the bad guys his location. Not gonna happen. And certainly shouldn't to give any legitimization to the faux trial.