Republican Rep. Anna Paulina Luna of Florida withdrew her membership from the conservative House Freedom Caucus on Monday amid a divide over whether the lower chamber should allow new parents in Congress to vote remotely around the birth of their child. 

"Wirh a heavy heart, I am resigning from the Freedom Caucus," she wrote to her colleagues in a letter obtained by CBS News.

Luna's discharge petition — a maneuver that allows members to circumvent House leadership — won enough support earlier this month to force a vote on a measure that would allow new parents to designate a colleague to vote for them for 12 weeks after they or their spouse gives birth. The bill would also allow that period to begin earlier if the lawmaker has a serious medical condition or isn't able to travel safely. 

But House Speaker Mike Johnson, a Louisiana Republican, opposes proxy voting, calling it unconstitutional. He confirmed last week discussions were taking place about how to block the measure.