Rep. Nancy Mace (R-SC) introduced a resolution on Monday to expel Rep. Cory Mills (R-FL) from the House of Representatives, escalating an intraparty conflict into one of the most serious procedural actions one lawmaker can take against another. Expulsion is an extraordinary measure that has only succeeded a handful of times in congressional history and requires approval from two-thirds of the full House.

The resolution follows scrutiny of Mills and comes amid broader congressional attention to member conduct. Mace's move is notable in that it targets a Republican colleague at a time when the House GOP holds a narrow majority, meaning any expulsion effort would almost certainly require Democratic support to succeed.

Axios reported that expulsion votes involving Mills and another member, Rep. Sheila Cherfilus-McCormick (D-FL), have drawn parallel attention on Capitol Hill, suggesting the chamber is confronting multiple conduct-related proceedings simultaneously. The specific allegations or conduct cited in Mace's resolution as grounds for expulsion have been the subject of reporting across multiple outlets.

Expulsion resolutions are rarely brought to a floor vote and even more rarely succeed. The last House expulsion occurred in 2002. The introduction of such a resolution, however, forces a public reckoning and can place significant political pressure on the targeted member and House leadership to respond.