Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate 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' MORE (D-W.Va.) is urging his Senate colleagues to sign a pledge to not campaign against each other heading into the midterm elections.

"I'm going to sign this pledge and I would hope that all of my colleagues will consider signing the pledge the same way. We're the only ones that can change it," Manchin said from the Senate floor, speaking next to a large version of the pledge.

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He added that "civility and trust" have been "lost in Washington."

Under Manchin's pledge, he won't directly fundraise against, campaign against or do mailing against a sitting senator.

Manchin argued that campaigning against sitting senators undercuts their ability to work together in Washington.

"That weekend they might be in my state campaigning against me, and then we come back on Monday and Tuesday and we're supposed to sit down and work through our problems and differences. ... I just think human nature doesn't let that happen and it won't produce good results," he said.

Manchin is up for reelection in November in a state Trump won by more than 40 percentage points. Democrats are defending seats in 10 states Trump won in 2016.

He recently engaged in a war of words with Vice President Pence after Trump's No. 2 knocked him for voting against the GOP tax plan.

Manchin fired back that the comments are part of why "Washington sucks."