WASHINGTON (AP) — After a raucous and — at times — crass debate in Detroit, Republican presidential candidate Marco Rubio is spending Friday looking for votes in Kansas.

One of four Saturday nominating contests, Kansas offers 40 delegates of the 155 in play this weekend.

Rubio trails second-place Ted Cruz in delegate count, and both men are well behind front-runner Donald Trump after the billionaire businessman won seven primaries on Super Tuesday to go with his three victories in February.

The Rubio campaign continues to argue that the Florida senator can reach the required 1,237 delegates required for the GOP nomination. The more likely best-case scenario for Rubio is that he and Cruz together earn enough delegates in the coming weeks to keep Trump from reaching the majority threshold.

That would set up an unpredictable Republican convention in July, when delegates at the Cleveland gathering would have to choose a nominee in open voting.