Today’s episode sets out what we know about the attempted assassination of former President Donald J. Trump at a rally in Pennsylvania on Saturday evening.Doug Mills, a photographer for The Times, recounts what it was like to witness the shooting, and Glenn Thrush, who covers gun violence for The Times, discusses the state of the investigation into the man who did it.Guest: 

• Doug Mills, a photographer in the Washington bureau of The New York Times.
• Glenn Thrush, who reports on the Justice Department for The New York Times.

Background reading: 

• What we know about the assassination attempt against Donald J. Trump.
• A Times photographer who was feet away from Mr. Trump describes the shooting.
• The gunman appears to have acted alone, but his motives remain unclear.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.