Rudy Giuliani claims Clinton wasn't in New York after 9/11. Here are photos from their joint tour of Ground Zero.

Pro tip to all current and aspiring politicians: If you're going to slam your opponent for not showing up to something important, make sure there aren't, you know, pictures of you two there together.

Rudy Giuliani, who was mayor of New York on Sept. 11, 2001, claimed Wednesday that he recalled Hillary Clinton once saying she was "there that day," presumably meaning the day of or directly following the World Trade Center attacks. "I don't remember seeing Hillary Clinton there," Giuliani told his audience.

Rudy Giuliani: "I was there" on 9/11, "I don't remember seeing Hillary Clinton there." https://t.co/iRB09cQ8eH

— ABC News Politics (@ABCPolitics) October 12, 2016

But there are multiple pictures of Clinton, then a senator for New York, visiting Ground Zero on Sept. 12, 2001, within 48 hours of the attack — and she is standing directly next to Giuliani:

Rudy: Hillary wasn't there on 9/11. She was in DC; came next morning, continued to be there. What a bizarre attack. https://t.co/EwvoX1PVcM pic.twitter.com/qi8i7wymGl

— Andrew Kirell (@AndrewKirell) October 12, 2016

Here is a picture of Rudy Giuliani and Hillary Clinton walking together through NYC post-9/11, after Clinton had flown back from DC pic.twitter.com/03gKLAwlQJ

— Jose A. DelReal (@jdelreal) October 12, 2016

If Giuliani meant Clinton wasn't in New York as the attacks unfolded, then yes, he is remembering correctly. Otherwise, maybe these photos will jog his memory.