A caucus is a group of representatives or senators who affiliate with the same political party or faction, such as "DFL Caucus," the "Republican Caucus," the "New Republican Caucus," the "Majority" caucus, or the "Minority" caucus. Also, any meeting of such a group is called a caucus.
The House of Representatives has web pages for party caucuses: the Republican Caucus, the New Republican Caucus, and the Democratic/DFL Caucus.
The Senate also has web pages for party caucuses: the DFL Caucus and the Republican Caucus.