Trump told Corker he was going to endorse him the day the Tennessee Republican announced his intention to retire, the sources said. "The President called the senator early last week and asked him to reconsider his decision not to seek re-election and reaffirmed that he would have endorsed him, as he has said many times," one of the sources said.
I have doubts that that is the way this went down. More likely, it was just the opposite.