The Senate has a specific set of 25 rules which dictate operations for a Senate impeachment trial. But the Senate’s only conducted 17 impeachment trials in history. No one knows how President Trump’s prospective Senate trial may look. Senate Majority Leader Mitch McConnell, R-Ky., and Senate Minority Leader Chuck Schumer, D-N.Y., have wrestled for days about the possibilities of a Senate trial. So far, neither side is giving any quarter.