Trump never thought he would win the election and he didn't want to win. He probably does not want win in 2020 and he's trying to make sure that doesn't happen.

"Even though the numbers in a few key states had appeared to be changing to Trump’s advantage, neither Conway nor Trump himself nor his son-in-law, Jared Kushner — the effective head of the campaign — ­wavered in their certainty: Their unexpected adventure would soon be over. Not only would Trump not be president, almost everyone in the campaign agreed, he should probably not be. Conveniently, the former conviction meant nobody had to deal with the latter issue."

I suggest read the rest of it at
http://darwinkilledgod.blogspot.com/2018/01/i-always-thought-this-was-true-and.html