WASHINGTON — Republican leaders in Congress said it’s all or nothing on Wednesday as they rejected a Democratic push to carve out food aid funding for more than 40 million Americans who stand to lose it as part of the government shutdown.

Democrats have repeatedly voted against reopening the government as they demand that Republicans negotiate with them to extend expiring health care subsidies. But they pushed for expedited approval of legislation to continue funding for the Supplemental Nutrition Assistance Program, or SNAP, in the meantime.

“It’s simple, it’s moral, it’s urgent,” Senate Democratic leader Chuck Schumer said as he called for passage of the SNAP funding Wednesday.

Senate Majority Leader John Thune, R-S.D., angrily objected to the Democratic request, calling it “a cynical attempt to provide political cover” for Democrats to continue the shutdown, now in its 29th day.

“We’re not going to let them pick winners and losers,” Thune said. “It’s time to fund everybody.”

If Democrats want to prevent damage from the shutdown, “they can end the shutdown,” Thune said.

The increasingly pointed statements from lawmakers on Capitol Hill reflected growing frustration and pressure that is building as the SNAP deadline looms and federal workers face missed paychecks this week.

Vulnerable families could see federal money dry up soon for some other programs, as well — from certain Head Start preschool programs to aid for mothers to care for their newborns through the Special Supplemental Nutrition Program for Women, Infants, and Children, known as WIC.

Another group at risk from the shutdown — members of the military — won’t miss a paycheck on Friday, as the Trump administration plans to tap existing accounts to cover their payroll.

The Department of Agriculture has posted on its website that the SNAP benefits will end Friday. “Bottom line, the well has run dry,” the statement read.

Almost two dozen states have filed a lawsuit arguing that President Donald Trump’s administration has the money to continue the benefits and is legally required to do so.