Badenoch supported Brexit in the 2016 UK EU membership referendum. She voted for then Prime Minister Theresa May's Brexit withdrawal agreement in early 2019. In the indicative votes on 27 March, she voted against a referendum on a withdrawal agreement and against a customs union with the EU. In October, Badenoch voted for Johnson's withdrawal agreement. In the December general election, she was re-elected with an increased majority of 27,594 (43.8%) votes.