Former Massachusetts Gov. Bill Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE (R) filed paperwork Wednesday declaring himself a candidate in the Republican presidential primary in New Hampshire next year.

Weld, along with former Rep. Joe Walsh Joe WalshSunday shows preview: Protests continue over shooting of Blake; coronavirus legislation talks remain at impasse Republicans officially renominate Trump for president Tucker Carlson responds to guest correcting pronunciation of Kamala Harris's name: 'So what?' MORE (R-Ill.), is waging a long shot challenge to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in the 2020 GOP primary for the presidential nomination. Former Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R-S.C.) dropped his primary bid Tuesday.

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Weld has been a consistent Trump critic since announcing his White House bid, slamming him as a “racist” who is dangerous for the Republican Party.

"Let's get one thing out of the way right at the beginning: Donald Trump is a raging racist, OK. He's a complete and thoroughgoing racist and he made that choice as a choice a long time ago," Weld said in July.

"And unless the Republican party in Washington expressly, expressly rejects the racism of Donald Trump they’re going to become to be universally viewed as the party of racism in America," he added.

Weld has hinged much of his challenge to Trump on the New Hampshire primary, hoping a strong finish in his neighbor state can propel his campaign.

Weld served two terms as Massachusetts governor from 1991-1997.

"My aim is to win the New Hampshire primary and if that happens, I think all bets are off. That's never happened," Weld said in August.

"I think this is doable, based on what I hear on the ground in New Hampshire," he added. "I've been talking to many more voters than Mr. Trump is up there."

However, Weld will face an uphill battle to put a dent into Trump’s support among New Hampshire Republicans.

A poll released in July by CNN and the University of New Hampshire found Weld polling at 7 percent in the state Republican primary, while Trump got the support of 86 percent of GOP primary voters.