Malik, a U.S. citizen, has lived in Washington since 1985 where he worked with various firms before becoming an independent financial consultant.
Trump's stance against Muslims coming in to the United States was understandable even to Muslims like himself, Malik said.
"I'm a Muslim, of course, but you can't have people going around just shooting people and killing people just in the name of Islam," he said.
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Malik defended his right to criticize his brother, citing freedom of expression.
"To each his own. I speak my mind and I'm not going to be put in a box just because my brother is the President of the United States," Malik said.