While their fireworks have earned Carly Fiorina and Donald Trump the most attention after Wednesday night’s Republican debate in California, the winner for the most detailed and substantive performance may go to Marco Rubio.

The debate covered several policy areas, but the moderators helped Rubio by asking him several questions about foreign policy and national security, the Florida senator’s area of relative expertise. Even with the assist, Rubio took full advantage of the opportunity, starting with a chance to distinguish himself from the GOP frontrunner, Donald Trump.