Weld served as a Republican governor from 1991 until 1997. He later became a Libertarian and ran for vice president on a ticket with former New Mexico Gov. Gary Johnson in the 2016 election.

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The clerk's office in Canton, Massachusetts, confirms on Tuesday that Weld recently changed his party registration to the GOP.

If he runs for president as a Republican, he could be Trump's first challenger within the party.

Weld has not returned messages from The Associated Press. He recently told WMUR-TV in New Hampshire that he would discuss his potential political plans during a Feb. 15 visit to the first primary state.