House Republicans next week will begin moving legislation to provide billions of dollars for wall construction at the southern border — a central campaign promise of President Trump that has so far eluded the GOP-led Congress.

The House Homeland Security Committee will mark up the legislation — the Border Security for America Act — on Oct. 4 , the panel announced Wednesday .

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The issue could lead to a partisan showdown in December, when funding for the government expires and Congress must enact another spending package to prevent a government shutdown.

Trump had launched his successful campaign on vows to build a “beautiful” wall along the southern border — a message that resonated with his white, conservative base. And earlier in the year, he had insisted that wall funding be a part of a 2017 omnibus spending bill, only to back off that position in the face of entrenched Democratic opposition. Still, in signing that package he threatened to shutdown the government later in the year if the wall money wasn’t included in 2018 spending bills.

This month, after a massive hurricane struck Texas and another was headed toward Florida, the president once again backed off his border funding demand, agreeing to a short-term spending bill that included emergency relief for the victims of Hurricane Harvey. Capitol Hill conservatives, who have also insisted on new wall money, have vowed to press the issue in December.