According to NBC, the incident occurred at a meeting of the National Rifle Association in Indianapolis (Indiana).

The video shows how the phone flies out of the crowd and gathered on the stage to the left of the president, who looked in that direction.

WATCH: It’s been a real challenge for the NRA in Indiana; the president continued with his speech. https://t.co/EX5y6i7NHppic.twitter.com/yfftcUi2yc

- NBC News (@NBCNews) April 26, 2019

In October 2018, the United States Secret Service, which deals with the protection of top officials of the state, intercepted a suspicious envelope that was addressed to the country's president, Donald Trump.