The past two years of Republican House control were defined by infighting as hardline conservative factions sought to gain influence and power by openly defying their party leadership. While Johnson ? at times with Trump’s help ? largely tamed open rebellions against his leadership, the right wing of the party is ascendant and ambitious on the heels of Trump’s election victory.

The Republican majority also depends on a small group of lawmakers who won tough elections by running as moderates. It remains to be seen whether they will stay on board for some of the most extreme proposals championed by Trump and his allies.

House Democratic Leader Hakeem Jeffries, meanwhile, is trying to keep Democrats relevant to any legislation that passes Congress, an effort that will depend on Democratic leaders unifying over 200 members, even as the party undergoes a postmortem of their election losses.

When Trump was elected as president in 2016, Republicans also swept Congress, but he still encountered Republican leaders resistant to his policy ideas, as well as a Supreme Court with a liberal majority. Not this time.

When he returns to the White House, Trump will be working with a Republican Party that has been completely transformed by his “MAGA movement” and a Supreme Court dominated by conservative justices, including three that he appointed.

“Republicans in the House and Senate have a mandate,” House Speaker Mike Johnson said earlier this week. “The American people want us to implement and deliver that ‘America First’ agenda.”

Republicans have won enough seats to control the U.S. House, completing the party’s sweep into power and securing their hold on U.S. government alongside President-elect Donald Trump.

A House Republican victory in Arizona, alongside a win in slow-counting California earlier Wednesday, gave the GOP the 218 House victories that make up the majority. Republicans earlier gained control of the Senate from Democrats.

With hard-fought yet thin majorities, Republican leaders are envisioning a mandate to upend the federal government and swiftly implement Trump’s vision for the country.

The incoming president has promised to carry out the country’s largest-ever deportation operation, extend tax breaks, punish his political enemies, seize control of the federal government’s most powerful tools and reshape the U.S. economy. The GOP election victories ensure that Congress will be onboard for that agenda, and Democrats will be almost powerless to check it.