Donald Trump believes American Muslims are hiding something. “They know what’s going on. They know that [Omar Mateen] was bad,” he said after the Orlando massacre. “They have to cooperate with law enforcement and turn in the people who they know are bad. … But you know what? They didn’t turn them in. And you know what? We had death and destruction.”

This is a common idea in the United States. It’s also a lie. First, Muslims like me can’t see into the hearts of other worshipers. (Do you know the hidden depths of everyone in your community?) Second, Trump is wrong that we don’t speak up when we’re able.

I know this firsthand: I was the one who told the FBI about Omar Mateen. […]

I am not the first American Muslim to report on someone; people who do that simply don’t like to announce themselves in to the media. For my part, I’m not looking for personal accolades. I’m just tired of negative rhetoric and ignorant comments about my faith. Trump’s assertions about our community – that we have the ability to help our country but have simply declined to do so – are tragic, ugly and wrong.

[Editor’s note: A federal law enforcement official confirmed the author’s cooperation to The Washington Post.]

More: I reported Omar Mateen to the FBI. Trump is wrong that Muslims don’t do our part.