The US Senate briefing on the shooting at the Trump rally has just ended. It is reported that the gunman of the rally shooting went to the rally site several days in advance to conduct a visit. The time interval between when the gunman was photographed and considered suspicious and when he opened fire was 62 minutes; the time interval between when he was spotted by snipers and when he opened fire was 20 minutes. Wray, director of the Federal Bureau of Investigation (FBI), said that the gunman has not been found to have foreign contacts, but no clear motive has been found. The gunman uses encrypted communication and uses little social media.