Republicans on Capitol Hill are laying the groundwork to push through an ambitious agenda with newly elected President Donald Trump once they gain full control of Washington in January — a rare Republican Party trifecta that party leaders say is now within reach.

And this time they will be willing to use it.

Their goal is to quickly start crafting major pieces of the Trump administration’s agenda, starting with a major economic package focused on taxes, energy policy, border security and deregulation, according to two people familiar with discussions .

GOP leaders dream of another major tax package, as many tax provisions are set to expire at the end of 2025.

Also on the table: Parts of the Inflation Reduction Act signed by President Joe Biden, a sweeping economic and climate bill that Democrats passed as they unified the government earlier in Biden’s term, may be reversed, a source familiar with the discussions told CNN.

Republicans also see an opening on other big issues, such as the Republican Party’s hardline immigration proposals, which have stalled since passing the House last year as Senate Democrats and the Biden White House strongly opposed that plan .

To remind: With Republicans winning control of the Senate, achieving Trump’s agenda will come down to whether the Republican Party retains a majority in the House of Representatives. CNN has not yet made a projection in the battle for control of the House of Representatives. But major developments in Pennsylvania and Michigan have party leaders hopeful that a full breakthrough is in sight, and top Republicans confident they will maintain their slim majority.

Even with unified control of the Republican Party, there would be challenges for Republicans. One problem is the political math: Republicans in the House of Representatives believe that if they keep the majority, it won’t be much. Mike Johnson – who is expected to retain his position as chairman – would have just a few votes left. And their current narrow majority is plagued by divisions and roadblocks.

Read more about the Republican agenda.

CNN’s Danya Gainor contributed to this report.