Sarah Palin. (AP) Sarah Palin. (AP)

Former Alaska governor Sarah Palin is set to announce Tuesday that she has signed on to the Defund Obamacare movement.

"Forced enrollment in Obama's 'Unaffordable Care Act' is weeks away," Palin says in a statement to be released by the Senate Conservatives Fund and shared early with Post Politics. "This beast must be stopped -- by not funding it. Today, Todd and I joined with many of our fellow citizens to urge those in the U.S. Senate to not fund Obamacare."

Defund Obamacare supporters pledge to not support any government funding that includes money for Obamacare.

Palin becomes the latest leading conservative voice to back the effort -- even as many in the party have balked at supporting it. Critics worry that it risks a government shutdown, and some Republicans have forcefully derided it.

Those who have yet to sign on are under increasing pressure from groups such as the Senate Conservatives Fund, Heritage Action, the Tea Party Patriots and For America, which have all run ads against them or held events targeting them.

The Senate Conservatives Fund and Palin have both endorsed against incumbents and against establishment-favored candidates in the past, and Palin's move suggests that Defund Obamacare will play a role in her future endorsement decisions.

"Those in the Senate and those seeking to serve there must stand strong against this devastating program before it reveals its true face now recognized by both sides of the aisle as the bureaucratic and economic beast that will deny our families, our businesses, and our sick the ability to access health care," Palin says in the statement. "Join us in urging senators -- Don't fund Obamacare! Just remember: if you fund it, you own it!"

Sens. Ted Cruz (R-Tex.) and Mike Lee (R-Utah) are expected to issue statements thanking Palin for her support and playing up its importance.

"She's a tremendous voice for liberty, and her strong support adds to our growing momentum to stop this 'huge train wreck' and help American families restore jobs and opportunity," Cruz will say.