New Jersey governor Chris Christie came out swinging against his rival for the GOP presidential nomination Marco Rubio Tuesday. In a Tuesday interview with radio host Laura Ingraham, Christie responded to Rubio’s claim that the Obama administration’s Deferred Action for Childhood Arrivals program could not be rolled back “immediately.”

The Florida senator told Univision host Jorge Ramos in April the DACA program, which exempts children who entered the country illegally from being deported, should “end at some point” in the future. “It cannot be the permanent policy of the United States but I’m not calling for it to be revoked tomorrow or this week or right away,” Rubio said.