Republicans in the U.S. House of Representatives will hold a slim 220-215 majority when the next Congress gets underway next month after Democrats picked up a seat in California, according to Edison Research on Wednesday.

Senate Republicans huddled behind closed doors Tuesday to plot the path forward for the unified control of government they won in the November elections, though GOP senators said afterward a very narrow House majority will likely determine how sweeping their policy proposals will be.

Republicans in the U.S. House of Representatives will hold a slim 220-215 majority when the next Congress gets underway next month after Democrats picked up a seat in California, according to Edison Research on Wednesday.

Republicans secured a 220-215 seat House majority on Tuesday, after California Rep. John Duarte conceded to Democrat Adam Gray. It’s the smallest advantage for one party since 1931 – and will be even smaller,

The House Republican conference will consist of 220 lawmakers, two fewer than the five-seat majority that the GOP struggled to manage in this Congress.

House Republicans are headed into next year with an even slimmer majority that will temporarily shrink to a zero-seat advantage in the early months of President-elect Donald Trump’s presidency, imperiling his ambitious agenda.

House Republicans pulled off what some members feared they couldn’t and defended their majority in the 2024 elections — but that slim control appears poised to winnow down to a one-seat majority at the start of next year,