I wouldn't blame him one bit if he chose not to run again. He had no support from the Republican Congress on immigration, or Obamacare. Even if the Republicans did take back the House and retain the Senate in 2020, there's no guarantee that Congress wouldn't be as weak-kneed as this one was. Couple that with the constant harassment and lies from the media, the continual battle with the courts trying to implement his immigration policy, the perpetual threat of impeachment, and investigations of him and his family. What other President has had to put up with all of that in just the first two years of their Administration? Lincoln had the Civil War. This is Civil War II.