Washington (CNN)President Donald Trump's tweets Sunday morning claiming he denied Sen. Bob Corker's request for an endorsement are false, two sources familiar with the discussions said.

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.

Trump attacked Corker in a series of tweets Sunday, days after the Tennessee Republican made public comments criticizing him, prompting Corker to respond by tweeting an insult later in the morning calling the White House "an adult day care center."