A group of conservative organizations called on Senate Majority Leader Mitch McConnell and his leadership team to step down on Wednesday, citing the GOP's failure to pass a bill to repeal Obamacare, which has been a top Republican campaign promise.

"You and the rest of your leadership team were given the majority because you pledged to stop the steady flow of illegal immigration," the group said in its letter. "You've done nothing. You pledged to reduce the size of this oppressive federal government. You have done nothing. You pledged to reduce, and ultimately eliminate the out-of-control deficit spending that is bankrupting America. You have done nothing. You promised to repeal Obamacare, 'root and branch.' You've done nothing. You promised tax reform. You've done nothing."

"It is time for you and your leadership team to step aside for new leadership that is committed to the promises made to the American people," the letter said. "America is too good for you to lead it."

The Senate is not in session this week, which the conservative group also criticized.

"You don't even show up for work," the letter said.

The letter pointed to a significant backlog of judicial vacancies, which McConnell appears to be ready to speed up by moving more quickly past procedural slow-down tactics Democrats have employed since January.

Conservatives called the Senate's failure to advance a measure to repeal and replace Obamacare "the greatest betrayal," and they also criticized lack of action on legislation banning abortions after 20 weeks.

The letter points out many of the critical agenda items have passed the House and are ready for signature by President Trump.

"President Trump and the House of Representatives have done their part," the letter said. "You sank it all."

The letter is signed by Senate Conservatives Fund President Ken Cuccinelli, Tea Party Patriots co-founder Jenny Beth Martin, FreedomWorks President Adam Brandon, Richard A. Viguerie, and Brent Bozell.