Former Trump campaign manager Corey Lewandowski Corey R. LewandowskiTrump faces tricky choice on Supreme Court pick How Trump can win reelection: Focus on Democrats, not himself Trump Jr. distances from Bannon group, says he attended 'single' event MORE said Thursday he's "seriously considering" a campaign in 2020 to challenge Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.).

"Jeannie Shaheen has failed the people of NH by voting in lock step with Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE and Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE," Lewandowski told The Hill. "The people of NH deserve better. If I run, I would be a voice for all the people of NH."

Lewandowski worked as President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s campaign manager until his firing in June 2016. He has remained a staunch ally of the president and has penned multiple books that take a favorable view of Trump. Lewandowski periodically appears on cable television to defend the president.

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In a statement, New Hampshire Democratic Party spokesman Josh Marcus-Blank accused Lewandowski of being a "craven lobbyist," who was "chomping at the bit" to undo New Hampshire's existing health care.

"Corey Lewandowski is a craven lobbyist who has been credibly accused of assault many times and is chomping at the bit to strip away Granite Staters' health care," he said. "Meanwhile, Senator Shaheen is making a difference for New Hampshire families, leading efforts in the Senate to expand access to health care and taking on the big drug companies to lower the costs of prescription drugs. The contrast couldn't be more clear."

Lewandowski was born in Massachusetts but has a home in New Hampshire where he lives when he's not in Washington, D.C.

He could appeal to Trump voters in a state the president handily carried during the 2016 GOP primary but narrowly lost to Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE in the general election.

Several other Republican candidates have already announced campaigns to challenge Shaheen.

Shaheen is seeking reelection in 2020 for her third term in the Senate. She received roughly 51 percent of the vote in both 2008 and 2014, defeating John Sununu and Scott Brown, respectively.

She previously served as the first female governor of New Hampshire and was the first female U.S. senator elected in the state's history.