one of his advisers linking king to the impeachment fight. >> i don't think it was within dr. king's vision to have americans dragged through a process where the president is going -- not going to be removed from office, not being charged with bribery, extortion, high crimes or misdemeanors >> reporter: president trump tonight is heading to switzerland for an international economic conference. something officials say shows how he still is conducting the business of the presidency. still late tonight a new cnn poll shows about half of americans believe he should be convicted and removed from office lester >> hallie at the white house thank you. as i mentioned at the top of the broadcast, the top republican just released his proposed rules for this first impeachment trial in more than 20 years nbc's kasie hunt is at the capitol tonight. kasie, what do we know >> reporter: lester, just in tonight, we have learned after opening arguments and senators' questions, the senate will hold a vote on whether to call witnesses in the president's impeachment trial.