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The Secret Service is still investigating whether Rose intended any threat toward the President, sources told Fox News.
The Marion County Sheriff's Office provided a statement to Fox News, saying they "assisted the US Secret Service today in an ongoing investigation. William Rose, a subject in the investigation, was transported to receive a mental health evaluation."
A video posted to social media, taken by attendee Bradley Brewer, shows the phone being launched into the air and landing on the stage to Trump’s left.
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“A man threw a cell phone on stage when President Trump walked out for his @nra speech,” tweeted Katie Pavlich, a Fox News contributor. “He threw it stage left, while POTUS was closer to stage right."
Then-President George W. Bush famously ducked a thrown shoe thrown at him by an Iraqi journalist in 2008 during a press conference in Iraq. The shoe missed Bush, and the journalist was forcibly removed from the room by security.