Washington (CNN) Former national security adviser John Bolton didn't offer any praise of President Donald Trump in remarks at a private event Wednesday, but instead took aim at his former boss' policies on the world stage, according to an attendee.

Bolton, who Trump fired earlier this month , made comments at an event hosted by the Gatestone Institute in New York that the attendee characterized to CNN as scathing in their criticism of Trump's approach to Iran, North Korea and Afghanistan. Politico was first to report on Bolton's remarks.

"Bolton didn't have anything positive to say about Trump," the attendee said.

While Bolton did not mention Trump by name, he said the idea of inviting the Taliban to Camp David was "disrespectful" to the victims of the September 11, 2001, terrorist attacks, according to the attendee. As CNN previously reported, Bolton and Trump got into a heated argument over the President's plan to host the Taliban leaders in the days before the 18th anniversary of the attacks, and Bolton did not back down, two people familiar with what happened said.

One senior official confirmed this argument happened in the Oval Office and at the end of the meeting, the President asked Bolton for his resignation.

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