The Republican Liberty Caucus (RLC) is a political action organization dedicated to promoting the ideals of individual liberty, limited government and free market economics within the Republican Party in the United States.

[8] Specifically, the RLC favors reduced government intrusion, lower taxes, elimination of federal agencies, less regulation, a strong national defense with fewer military bases abroad, and no foreign aid.

[10] The Republican Liberty Caucus' process for endorsing presidential candidates is described in the organization's Bylaws and Rules: A candidate for President of the United States may be endorsed by the Caucus by a 2/3 vote of the active and voting Chartered state's executive committees.

The national Secretary shall notify all Chartered states of a favorable national board proposal for endorsement and state executive officers shall inform the Secretary of the approval or denial by their executive committee within 60 days.

[16][17] The Republican nominee in Rhode Island challenged Democratic United States Senator Sheldon Whitehouse while the Republican nominee in Connecticut ran for an open seat being vacated by independent United States Senator Joseph Lieberman.