TRENTON, N.J. (CBSNewYork/AP) — A coalition of New Jersey’s Black mayors on Friday denounced Donald Trump’s call for a ban on Muslim immigration and called for a national boycott by individuals, businesses, and clergy of all of Trump’s casinos, golf courses and other assets.

The New Jersey Black Mayor’s Alliance for Social Justice, which includes 21 officials, announced its decision in a statement.

The mayors say Trump’s call for a total shutdown of Muslims entering the country is unconstitutional and dangerous.

“Donald Trump’s very vocal support for a total and complete shutdown of Muslims entering the United States is unconstitutional, un-American and dangerous. We can’t let our fear of terrorism cause us to forget who we are as a nation,” the group said in a statement.

Mayor Frank Minor of Logan Township says the mayors reached the boycott decision after circulating the idea among members. He says a majority approved.

Trump’s campaign did not immediately reply to a message seeking comment.

Trump’s assets include Trump National Golf Course in Colts Neck as well as hotels and other real estate across the country and world.

“It is critical for our leaders to demonstrate in every possible way that Donald Trump does not speak for America,” the mayors’ said. “The New Jersey Black Mayors Alliance for Social Justice urges all Americans, our citizens, businesses, clergy, cities and states to boycott Donald Trump’s casinos, golf courses and other assets. Trump is paying for his campaign with his own money. So, if we continue to spend money at his businesses, we empower him to make his vile statements. Let the boycott begin!”

The Republican presidential candidate has come under fire after calling for a complete and total ban on Muslims entering the United States, five days after Syed Farook and Tashfeen Malik, a Muslim couple the FBI said was radicalized for some time, gunned down 14 people in San Bernardino, California.

Trump said his plan would not be unconstitutional because it doesn’t impact American citizens.