Yes, he appears to think so. He knows that the Republican senators will support him against the Democrats in the House. So, this scenario will hold true if the present economic performance remains the same. As such, the Democrats may have to swallow their pride until the general election to oust Trump out.
https://www.yahoo.com/news/trump-declares-himself-unimpeachable-based-on-perhaps-the-greatest-economy-ever-202805145.html https://www.yahoo.com/news/trump-declares-himself-unimpeachable-based-on-perhaps-the-greatest-economy-ever-202805145.html
