Republican presidential hopeful and New Jersey Gov. Chris Christie blasted New York Mayor Bill de Blasio Tuesday for “deluding Americans” on the city’s crime rate.

“I’m just stunned as are most people who live in this area, that this has been the safest summer in New York,” Christie said on MSNBC’s “Morning Joe,” just minutes after the Democratic mayor and his wife left the same set after their own appearance on the show. De Blasio highlighted police records showing that the summer was New York City’s safest in two decades.

“No one else believes it, except the two people who were just on your set,” Christie said of the mayor’s claim.

On “Morning Joe,” de Blasio argued that while homicides are up slightly, crime overall is down in New York City to its lowest point in 20 years. New York City data support the claim. But Christie, who is struggling to gain footing in the Republican presidential primary, ripped the Democratic mayor’s “liberal policies” and argued they have diminished the quality of life in the city his state borders. More on MSNBC.