The power shift could bring new investigations into China, Hunter Biden and the Department of Justice if Republicans take control of the House.
The first thing a GOP-controlled House will do is introduce a bill to tighten security at the southern border, McCarthy said over the weekend.
If the GOP takes the House, leadership is preparing to restart investigations into allegations of tax fraud against Biden's son, Hunter, starting with the release of new findings related to the younger Biden's bank activity.
McCarthy said Republicans will conduct immediate oversight of the agency if they take power.
McCarthy told Punchbowl News in October that the U.S. will not give a "blank check" to Ukraine.
Republican leaders have promised to investigate threats the country poses to U.S. cybersecurity and the global supply, as well as China's role in the origins of the Covid-19 Pandemic.
Republicans want to cut government spending, roll back Biden-approved corporate tax increases and cater to corporations by reducing funding for the IRS in order to reduce inflation.
The right-wing House Freedom Caucus could make it hard for McCarthy to get his way. The chances of the group mounting a challenge to his speakership bid are not off the table. McCarthy has expressed opposition to reinstating a procedure that would allow it to impeach the speaker.
The number of Republicans in the House will be determined. There are 39 House races that haven't been decided as of Thursday. Republicans are one win away from taking the majority. While the GOP is expected to gain control of the lower chamber, their margins are likely to be less than they hoped.
New leadership is expected to be elected on Wednesday. McCarthy has announced that he is running for speaker.
The Members are vying for top spots in the Republican-controlled House.
The biggest surprises from election night were not a red wave.