Washington - Within an hour of New York City Mayor Bill de Blasio joining the Democratic presidential race, he and President Donald Trump were already trading barbs.

During a Thursday morning appearance on “Good Morning America,” de Blasio borrowed one of Trump’s favorite tactics by giving the president a disparaging nickname: Con Don.

“He’s a con artist. I know his tricks I know his playbook,” the mayor said.

Trump tweeted that de Blasio is “considered the worst mayor in the U.S.”

The president added, “but if you like high taxes & crime, he’s your man. NYC HATES HIM!”