Writing on Twitter, the ex-CEO of the social media platform took a shot at President Donald Trump on Friday night, saying that meeting with the president is like voluntarily “waterboarding yourself.”

Dick Costolo was responding to news reported by Buzzfeed that Trump will meet once again with entrepreneurs and venture capitalists on emerging technology.

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According to Buzzfeed, the Office of Science and Technology Policy (OSTP) is organizing the event, scheduled for June 22, and invitees include Apple CEO Tim Cook, Amazon CEO Jeff Bezos and Oracle co-CEO Safra Catzn among others.

Noting the meeting, Costolo quipped, “If you don’t get invited to this meeting and want to know what it was like, just drink a bottle of gin and then waterboard yourself.”

You can see Costolo’s tweet below: