Story highlights Sanders veterans, allied activists and organizers have launched a new political action committee

The group is demanding that Democrats on Capitol Hill uniformly oppose all Trump nominees

(CNN) The progressive coalition solidified by Bernie Sanders' insurgent campaign and energized by the broad liberal backlash to President Donald Trump is preparing to launch primary challenges against elected Democrats they see going wobbly in the fight against the new administration.

To press the issue, Sanders veterans, along with allied activists and organizers, have launched a new political action committee called We Will Replace You . The group is demanding that Democrats on Capitol Hill uniformly oppose all Trump nominees, including Supreme Court nominee Neil Gorsuch, demand the firing of top Trump strategist Steve Bannon and use all the levers of their limited congressional power to gum up the White House agenda -- or face opposition from within their own party.

They are also asking new supporters to sign a pledge -- written at the top of their homepage -- promising to back "primary election challengers against any Democrats who won't do everything in their power to resist Trump."

Some Democrats are collaborating with Trump. Tell them resist -- or we'll replace you with someone who will. https://t.co/TVHy048H3N pic.twitter.com/4ABPfy4P0X — #AllofUs (@TimeForAllofUs) February 15, 2017

"Democrats need to know there is an actual political cost and this isn't just going to be folks showing up at their offices, but folks showing up at the ballot and different organizations supporting challengers who are going to push the party in a different direction," said Max Berger, a co-founder of #AllOfUs, the millennial progressive group that launched the new campaign.

Early opposition to the Trump administration, most visibly in the form of mass protests and rowdy recriminations against Republicans at town hall meetings around the country, has turned up the heat on long-simmering efforts by the left to pressure moderate Democrats. With the party now totally out of power in Washington and at a crossroads, activists who gained experience during Occupy Wall Street and through work with the Movement for Black Lives, the Fight for $15 and other aligned causes see an opportunity for greater influence.

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