Unless Republicans perform some rapid spine stiffening, another GOP cave-in on a bloated spending bill littered with egregious provisions is on tap for this month.

A massive spending bill that must pass by Dec. 11 to avoid a partial government shutdown threatens to allow President Obama’s Syrian refugee program, fund his immigration initiatives and capitulate on Planned Parenthood funding.

No one knows the precise language of the $1.1 trillion “omnibus” bill, which House and Senate leaders are negotiating in secret. But conservatives in and out of Congress warn that House Speaker Paul Ryan, R-Wis., and Senate Majority Leader Mitch McConnell, R-Ky., are unlikely to break from past practice during showdowns with the president.

Sen. Jeff Sessions, R-Ala., this week indicated the 13 spending bills that will be combined amount to a “blank check” on the refugee resettlement program.

“It will allow the refugee policy to continue, by which the president can bring in as many refugees as he desires,” Sessions said Friday on “The Laura Ingraham Show.”

“He has the power to decide that,” he said.

All refugees are immediately eligible for government assistance programs, and Sessions argued that refugees, and their relatives who later join them, will be a drag on Social Security, Medicare and other entitlements.

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Ira Mehlman, a spokesman for the Federation for American Immigration Reform, concurred with Sessions’ analysis.

“The pattern has been among people in leadership to talk about defunding but not doing it,” he told LifeZette.

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Mehlman said Republicans would be in a stronger position politically to pick a shutdown fight with Obama and congressional Democrats over the refugee program because public opinion is running against allowing refugees from the war-torn region into the United States.

“If they really wanted to, they could really back them in a corner,” he said.

It is not just the refugee program. Mehlman said he does not expect Republican leaders to cut off funds needed to implement Obama’s 2014 executive decrees protecting many illegal immigrants from deportation. Two provisions of the president’s plan remain blocked by the courts, but eight other sections have taken effect. Experts said the bill also likely will keep intact federal funds for so-called “sanctuary” cities and counties that refuse to cooperate with federal immigration authorities.

Mehlman said it also appears likely that the spending bill will include changes to the nation’s H-2B visa program for non-agricultural, temporary workers. Currently, the government is limited to issuing 66,000 per year. But supporters want to expand that by not counting returning HB-2 workers against the cap.

Rep. Steve Chabot, R-Ohio, sponsored a bill last month to do that, and also remove the Department of Labor from the regulatory process, and simply rely on companies certifying that they tried and failed to find Americans at the same pay for jobs performed by the foreigners.

Mehlman said his group expects Congress to roll the bill into the spending package.

Conservatives also are pushing to reduce funds for Planned Parenthood and repeal part of the Affordable Care Act.

House Minority Leader Nancy Pelosi, D-Calif., reportedly rejected a number of provisions that Republican leaders plan to include in the bill, including language that would add new background-check requirements for Syrian refugees. Democrats also object to proposals to lift the oil-export ban.

Conservatives also are pushing to reduce funds for Planned Parenthood and repeal part of the Affordable Care Act. The Senate, under procedures that require only 51 votes instead of 60 typically required to cut off debate, is expected to vote Thursday on those two proposals.

It would mark the first time both the House and Senate have voted to repeal Obamacare. But it remains to be seen whether the House will agree to include the Senate language in the spending bill.

David Christensen, vice president of government affairs for the Family Research Council, said a clean vote on Planned Parenthood and Obamacare separate from the spending legislation is preferable because it stands the best chance of reaching the president’s desk. The spending bill has so many other so-called “riders” that threaten to bog it down, he noted.

“Right now, the omnibus is already viewed as a Christmas tree by conservatives on issues that we care about,” he said.

Obama has vowed to veto any measure to eliminate funding for Planned Parenthood or to gut his signature health care law.