The group, Correct The Record, says it has mailed versions
of Donald Trump's well-known "Make America Great Again" trucker hat to Republican candidates, each with a candidate-customized take on what the group considers anti-Muslim rhetoric.
"The hateful proposals of the rest of the Republican presidential field are just as outrageous as Trump's," the group said in a statement.
For example, Texas Sen. Ted Cruz was sent a hat that reads "Religious tests" below "Make America Great Again," which is a reference to when he applied a "religious test"
to determine which Syrian refugees to admit into the United States.
"Despite their feeble protests of Trump's ban on Muslims, all of the GOP contenders would still support Trump as their nominee," Adrienne Watson, a Correct The Record spokeswoman, said in a statement. "We hope these personalized hats will help the Republican hopefuls to show America their true colors before the debate. They all act like Trump; now they can look like him too."
Trump, speaking to CNN's Jake Tapper on Sunday's "State of the Union," defended his call for a ban on all Muslim travel to the U.S.
"I have many friends that are Muslims, and I will tell you, they are so happy that I did this because they know they have a problem," Trump said. "I'm not looking to be politically correct. I'm doing this to do the right thing. This and other things. When I say this -- I'm running to do the right thing. I'm doing the right thing. Our country has a problem. People are in fear. They're waiting for the next attack."