The Jewish teacher was killed while protecting students in his classroom at Stoneman Douglas High School.
Confrontations with members of the public caused Pruitt to switch to flying first or business class whenever possible, at the recommendation of the head of his security.
The American-Jewish comedian started the conversation by tweeting her support for freeing Palestinian Ahed Tamimi from an Israeli military prison.
The U.S. Embassy and the Presidents Conference disputed the Israeli TV report of the closed meeting, saying David Friedman's words were taken out of context.
The 23 Jewish groups noted that the current wave of anti-Semitism is a response to the controversial amendment limiting rhetoric on the Holocaust.
Israeli Prime Minister Benjamin Netanyahu and U.S. Ambassador to the United Nations Nikki Haley also were confirmed as speakers to the annual policy conference.