On the Republican side, Texas Senator Ted Cruz defeated front-runner Donald Trump in the Kansas and Maine caucuses, while Trump won in Louisiana and Kentucky. Trump called for Florida Senator Marco Rubio to drop out of the race, saying he wanted to take on Cruz one on one. But Rubio won the primary in Puerto Rico, sweeping all 23 delegates. Retired neurosurgeon Ben Carson meanwhile has suspended his campaign. And Ohio Governor John Kasich has picked up the endorsement of actor and former California Governor Arnold Schwarzenegger, who is set to replace Donald Trump on the reality TV show “The Apprentice.” As the Republican establishment seeks to block Trump from taking the nomination, one possible strategy is for Rubio and Kasich to remain in the race, dividing the delegates in the hopes of producing a brokered convention. Meanwhile, outside groups are reportedly gearing up to spend millions of dollars on anti-Trump attack adds in Florida and Illinois ahead of key contests there.