Melina Mara/The Washington Post via Getty Images Sen. Susan Collins (R-Maine) is among the vulnerable lawmakers Sunrise Movement activists hope to pressure into supporting a Green New Deal.

Last November, young activists wielding yellow signs calling for dramatic climate action and clean-energy jobs occupied Rep. Nancy Pelosi’s office, demanding top Democrats champion a Green New Deal.

Now it’s Republicans’ turn.

On Wednesday, activists with the Sunrise Movement, the left-wing group whose protests propelled the Green New Deal into the national debate, are set to announce plans to start targeting Senate Republicans facing tough 2020 re-election bids in swing states, including Susan Collins (Maine), Thom Tillis (N.C.) and Martha McSally (Ariz.), HuffPost has learned.

Spokespeople for the senators did not respond to requests for comment on Wednesday.

Other likely targets include Sens. David Perdue (R-Ga.), Cory Gardner (R-Colo.), Joni Ernst (R-Iowa) and Senate Majority Leader Mitch McConnell (R-Ky.).

The move comes a day after McConnell, in an apparent bid to upend the Green New Deal’s growing momentum, promised to hold a vote in the Senate on what’s expected to be the landmark joint resolution Sen. Ed Markey (D-Mass.) unveiled last week alongside Rep. Alexandria Ocasio-Cortez (D-N.Y.).

“Mitch McConnell is going to regret this sorry attempt to stop the Green New Deal,” said Varshini Prakash, Sunrise Movement’s executive director. “He is so out of touch with regular people and so in the pocket of his fossil fuel billionaire campaign donors that he thinks bringing the Green New Deal for a vote will be a political win for him and his fossil fuel billionaire cronies.”

The group held a call at 8 p.m. Wednesday to rally its army of thous of volunteers.

Sunrise Movement isn’t turning the heat down on Democrats, whom it sees as the primary vessels for pushing a patchwork of legislation to fulfill the goals outlined in the resolution, particularly in the lead-up to the 2020 election. On Wednesday, the group rallied more than 80 protesters outside Senate Minority Leader Chuck Schumer’s New York office, calling on the Democrat to support the resolution.

But unlike health care, taxes and other policies with clear ideological battle lines, Republicans ― no longer able to deny the science behind climate change outright as a large majority of Americans understand its realities ― are struggling to articulate an alternative vision of how to prepare for an increasingly frightening, hot future. In the Sunrise Movement’s view, the Green New Deal’s momentum will take more cynical political ploys.

It’s unclear when McConnell will schedule the vote, but it could come as early as next month.

The Senate leader’s announcement followed days of Republican attacks on the Green New Deal that ranged from traditional critiques of a big-government policy approach to wild-eyed tirades filled with blatant misinformation about the resolution itself.