CBS Evening News with Norah O'Donnell, 06/17/24

An off-duty secret service agent was robbed at gunpoint in the city of Tustin, Orange county. President Biden was there over the weekend and the agent was returning from an assignment. Officials say the agent fired his weapon, but it's not known if the suspects were hit. Investigators are looking for a silver infinity or similar car seen leaving the crime. The presidential election is now 20 weeks away and the first debate, ten days from now, and tonight we are learning the unique rules both president Biden and Donald Trump agreed to before their head-to-head showdown.