Donald Trump has said the United States should "seriously" consider profiling Muslims as a terrorism-fighting tool.
The presumptive Republican presidential nominee said that it was a matter of choosing "common sense" over "political correctness".
Mr Trump argued that it was "not the worst thing to do", and added that other countries use profiling.
Profiling is the government practice of targeting people for investigation based on factors such as their race, religion or nationality.
Mr Trump also reiterated his support for more scrutiny of mosques when he spoke to CBS's Face the Nation.
Civil libertarians have decried the practice as discriminatory.
Previously the outspoken billionaire has also proposed a temporary ban on foreign Muslims from entering the US.