democrats blasting the republican-drafted road map as a cover-up, but managing to win an early concession from the republican leader. peter alexander starts our coverage reporter: tonight president trump is officially on trial. the senate will convene as a court of impeachment. reporter: both sides, house democrats who will prosecute, and the president s defense team arriving in the capitol, a dramatic scene on the senate floor. all 100 senators, the jurors warned not to speak. hear ye, hear ye, hear ye, all persons are commanded to keep silent on pain of imprisonment reporter: it follows a bitter clash over rules mitch mcconnell saying he was following the bill clinton impeachment model that allowed each side 24 hours to make its case. the process was good enough for president clinton and basic fairness dictates it ought to be good enough for this president as well. reporter: but democrats objecting to a key difference from the clinton rules, new limits that would force