This article presents an empirical investigation into the factors influencing therenomination of legislators by party leaders for their continued presence inCongress. We argue that legislators who have previously held influentialpositions within Congress, such as Committee President, have a successfultrack record of (co)sponsoring bills, and have built distinguished politicalcareers, are more likely to be renominated in Congress. To test this theory,we employ an original dataset sourced from the Mexican 2018–2021Chamber of Deputies, which comprises the inaugural group of Congressmembers allowed to seek reelection after a 90-year prohibition within thecontext of a transforming party system marked by the diminishing electoralattractiveness of traditional parties. Our findings carry significant implicationsfor comprehending how party leaders recognise and reward legislators whoeffectively safeguard the party’s interests and uphold its reputation inside thehalls of Congress.