Kevin McCarthy has long been struggling to get his conference in line to avoid a government shutdown this fall, as his most extreme members try to leverage a funding impasse to protect Donald Trump and force a political impeachment inquiry against President Joe Biden. But now, as Congress returns from recess, the right is emphasizing another demand for a spending measure: Build Trump’s border wall. “It’s massively important,” Texas Republican Chip Roy, a leading House extremist, told CBS News Monday. “We need to do it.”

“If somebody’s getting all squeamish about the border wall, I mean, frankly, my response is: Kiss my ass,” Roy added.

Immigration has been a sticking point throughout the entire standoff, along with the Freedom Caucus’s opposition to Ukraine aid, funding for so-called “woke” Pentagon policies, and for the supposed “weaponization” of the Justice Department under Biden. But the wall—the symbol and centerpiece of Trump’s hardline immigration agenda—seems to have emerged recently as a particularly significant demand in the funding fight, as the right coalesces around a new refrain: “No border security, no funding.”

Biden’s border policies have been a matter of bipartisan criticism, with frustrations mounting among some Democrats as blue cities struggle to address the migrant crisis. But the right-wing attacks on the administration—which they’ve accused of turning a blind eye to drug smuggling and child trafficking in favor of “open borders”—have been extreme, with some even suggesting Biden should be impeached over his handling of immigration. “Frankly, because of the border invasion that’s been facilitated by this president—on purpose, willfully, intentionally—the president ought to be impeached for that,” Republican Congressman Bob Good told NewsNation over the weekend. “He’s violating his oath of office to protect the United States.”

Colorado Representative Lauren Boebert—one of the most extreme members of McCarthy’s conference—has attempted to rally her fellow Republicans around just such an impeachment push. But the House speaker has tamped down her efforts, while fellow extremist Marjorie Taylor Greene called her a “little bitch” for copying her own impeachment articles. Now, though, both hardline border demands and an impeachment ultimatum from Greene are two of the biggest obstacles facing McCarthy as he seeks to pass a continuing resolution to keep the government open. His counterpart, Senate Majority Leader Chuck Schumer, called Friday on lower chamber leaders to “follow the Senate’s incredible lead and pass their appropriations bills in a bipartisan way.”

“We cannot afford the brinkmanship or hostage-taking we saw from House Republicans earlier this year when they pushed our country to the brink of default to appease the most extreme members of their party,” Schumer wrote in a “dear colleague” letter heading into the Labor Day weekend.

But the far-right—frustrated with McCarthy over the deal he struck with Biden to avoid a catastrophic default—may have emerged from that debt fight even more resolved to “hold the line,” as Roy, who recently hinted at interest in McCarthy’s job, put it on Newsmax last month. Schumer, in his letter, warned against indulging the MAGA right’s “political games.” Roy’s response, as lawmakers return to Capitol Hill: “Game time.”