In a tweet this morning, Romney thanked real estate mogul and prominent birther Donald Trump for his endorsement.
Trump had already claimed credit for Romney’s victory in an interview on Fox News Channel.
The endorsement last week came after a day of confusion about whether the reality TV star would endorse Newt Gingrich instead. In the end, he put his clout behind Romney, though Democrats were quick to crow that the support of the increasinly unpopular Trump might actually hurt him in a general election.