As Donald Trump announces his cabinet picks and develops his policy priorities, many of the Biden administration’s final policy measures could soon be rolled back and permanently prohibited, thanks to Democratic gambles and an obscure federal law increasingly weaponized by Republican lawmakers.

Leaning on a piece of 1996 legislation called the Congressional Review Act (CRA), the incoming Trump administration and a Republican Congress will be empowered to easily repeal at least eight hundred of President Joe Biden’s final regulatory initiatives, including victories such as lead poisoning protections, methane emission reductions, strengthened childcare programs, and automatic flight refunds.

Republicans now look set to control the Senate and the House as final races are called around the country, giving them a governing trifecta they could use to wipe away these rules and dramatically shift the regulatory landscape — though it remains unclear if Trump’s latest appointments could jeopardize this majority.