West Virginia Republican Rep. Evan Jenkins announced Monday he will challenge Sen. Joe Manchin Joseph (Joe) ManchinSenate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (D-W.Va.) next year.

Manchin is seen as one of the most vulnerable Senate Democrats in the country, and represents a state easily won by President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE in last year's election.

The former governor is also one of the best-known politicians in his state, however, and he has worked carefully to cultivate an independent image.

That's an image Jenkins will look to attack; on Monday, he argued that Manchin had "changed" since coming to Washington in 2010.

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"Joe changed when he got to Washington. West Virginia values? Not anymore," Jenkins says in an announcement vide on his campaign website.

Jenkins focuses on Manchin's decision to author compromise legislation in 2013 that would have strengthened background checks on gun sales. That bill, which failed in the Senate, is proof that Manchin won't stand up for the Second Amendment, Jenkins said.

"Joe Manchin broke that promise, violating our values and pushing gun control with Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE and the New York liberals," Jenkins says, as footage plays of then-President Obama and others talking about Manchin's work on the bill.

Jenkins is a top recruit for the seat, so his entry will help boost Republican hopes that the party can knock off Manchin. Other Republicans are publicly weighing a bid, including fellow Reps. David McKinley David Bennett McKinleyEnergy secretary says pipeline setbacks pose national security issue MLB, Congress play hardball in fight over minor leagues Koch campaign touts bipartisan group behind ag labor immigration bill MORE and Alex Mooney, along with state Attorney General Patrick Morrisey

West Virginia is one of the 10 states where Democrats are defending a Senate seat in a state won by President Trump in 2016.

Republicans are also defending just eight seats overall compared to 25 for Democrats.

Trump won a larger share of the vote in West Virginia than in any state except Wyoming, a fact Jenkins played up.

"With Donald Trump in the White House, we've got a real chance to turn things around," Jenkins says as video of Trump meeting with miners plays on the screen.

"He needs our help and I need your help."

This story was updated at 4:29 .m.