Fla., is resigning from the House Freedom Caucus, she announced in a letter to fellow conservatives on Monday. It's the latest escalation in her fight against House GOP leaders and a small group of members on the right flank of their conference over the issue of proxy voting.

Luna introduced a bipartisan measure to allow new parents in Congress to vote remotely around the birth of their child. Some conservatives are trying to stop it.

Anna Paulina Luna wrote in a letter that she was leaving the House Freedom Caucus over their stance on her efforts to let new parents vote by proxy.