Former Massachusetts Gov. William Weld has changed his party registration from Libertarian back to Republican as he mulls a possible primary challenge against President Donald Trump.
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.
The clerk's office in Canton, Massachusetts confirmed Tuesday that Weld recently changed his party registration to the GOP.
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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. Weld is expected to visit New Hampshire Feb. 15.