NYPD police demonstrate against Bill de Blasio outside the Fox Theater where the second Democratic Presidential Debate is being held.

DETROIT, Mich. — A local police union president blasted Bill de Blasio at an NYPD union protest of the mayor outside the Democratic debate venue in the Motor City Wednesday.

“We’re trying to get the attention of their mayor and it’s sad they have to go to this extent to do it but they came to Detroit to ask for our help and we’re here to help them,” said Lt. Mark Young, president of the Detroit Police Lieutenants and Sergeants Association.

New York’s powerful Police Benevolent Association is headed to arbitration with the city over a new contract.

Young joined about 15 members of New York City’s PBA across from the Fox Theatre in downtown Detroit.

“You can’t run the city, you can’t run the country!” the PBA members chanted as audience members filed into the venue.

“Bill de Blasio, no friend of labor!” they shouted.

“Mayor de Blasio is campaigning across the country stating he’s a friend of labor, ‘Working People First,’ ” said PBA treasurer Pat Hendry, quoting the struggling presidential contender’s 2020 slogan.

“That’s a lie. Mayor de Blasio puts working people last,” Hendry said.

“Mayor de Blasio offers low inflation raises while giving himself a 15 percent raise,” Hendry said.

Cops have dogged de Blasio around the country during his quixotic presidential campaign, taking out an ad in the Miami Herald during the first Democratic debate and hiring an electric billboard truck in Florida and Michigan to highlight their labor dispute.

Hendry said union members would continue to “follow the mayor until he comes to the table, he supports police officers and he pays police officers better.”

A de Blasio campaign spokeswoman declined comment.