At some point in 2019 (if not sooner) a Republican Senator may walk into the Oval Office and say to President Trump: “Mr. President, we don’t have the votes,” at which point the Trump presidency will end in a resignation or a conviction in the Senate.
This scenario actually occurred forty-three years ago this summer when Republican Senator Barry Goldwater walked into the Oval Office and told Republican President Richard Nixon that they didn’t have the votes in the Senate to save his presidency.
Following impeachment in the House, a trial takes place in the Senate. Conviction requires two-thirds of the Senate and by my count there are already twelve senators who have shown a willingness to take on the president when they believe he is in the wrong.
If you add that to the forty-eight Democrats in the Senate (who have shown no inclination to work with this President), Donald Trump could be six votes away from conviction in the Senate