Chris Christie thinks Donald Trump s stance on immigration makes him unfit for office.

Christie continued to make his case against his rival for the Republican presidential candidacy during an appearance on CNN s State of the Union on Sunday, where he called out the former president for comments he made at a campaign event in New Hampshire the day prior.

Trump, the GOPs current front-runner, was openly xenophobic during the speech, where he told crowds that immigrants are pouring into the U.S. and poisoning the blood of our country.

Hes disgusting, Christie told CNNs Jake Tapper. And what hes doing is dog-whistling to Americans who feel absolutely under stress and strain from the economy and from the conflicts around the world. And hes dog-whistling to blame it on people from areas that dont look like us.