Jeb Bush’s super PAC turned up the heat on Marco Rubio on Monday, unveiling a new $3 million-plus television spot to the Washington Examiner that accuses the Florida senator of being an immigration flip-flopper who supports amnesty.

The advertisement might raise eyebrows since Right to Rise USA is hitting Rubio on an issue on which he and Bush, both rivals for the Republican presidential nomination, agree. Rubio and Bush, the former Florida governor, have both expressed support for a pathway to citizenship for some illegal immigrants. The position has proven to be a political vulnerability for both candidates, but more so for Bush, who trails Rubio in state and national polls.