In an interview with NBC News on Friday, the son of a Pakistani immigrant bus driver said Trump's "ignorant" views on Islam were "inadvertently playing into the hands of extremists" who prey on young Muslims.
"To suggest that it's incompatible to be Western and to be Muslim is, I think, really, really risky," Khan said during a visit to a London elementary school.
Real-estate mogul and reality TV star Trump in December suggested a temporary ban on all Muslims entering the U.S. after a deadly mass shooting in San Bernardino that officials said was inspired by Daesh (ISIL).
Trump's proposal triggered widespread criticism and condemnation from global political and religious leaders.