A prominent Muslim group is challenging Republican presidential front-runner Donald TrumpDonald TrumpTrump used charity money to buy himself signed Tebow helmet: report Sanders: I don't hate Clinton Limbaugh predicts violence from left if Trump wins MORE to a debate, after his streak of controversial comments about Muslims.
The public policy organization also accused Trump and his supporters of being "scared of anything that is different than you."
Trump came under fire on Friday after repeating a hoax tale about U.S. General John Pershing executing Muslim prisoners in the Philippines with bullets "dipped in pig's blood."
"You rely on the promotion of fear and Internet lies to fuel the flames of hate and divisiveness across our country," the letter continues. "Well, we have news for you: We will no longer be bullied. We will no longer be your punching bag."
In the letter, the group challenged Trump to debate a representative from the American-Muslim community "on the issues" he has "raised about Islam and Muslims."