Congressional leaders reached a $1.66 trillion agreement Sunday to finance the federal government in 2024, preserving funding for key domestic and social safety net programs despite GOP demands to cut the budget.

Now lawmakers are up against a stiff deadline to pass legislation to codify the deal and avert a partial government shutdown in less than two weeks. Funding runs out for roughly 20 percent of the government — including for essential programs such as some veterans assistance, and food and drug safety services — on Jan. 19, and money for the rest of the government runs out shortly after that, on Feb. 2.

The agreement, announced jointly by Senate Majority Leader Charles E. Schumer (D-N.Y.) and House Speaker Mike Johnson (R-La.), will almost surely face vehement opposition from far-right House Republicans, who had hoped to force steep budget cuts.