The boos were "ferocious," notes the Week, and occurred more than once. Donald Trump's immediate reaction to Jeb Bush's explanation of his ISIS strategy was to declare, to boos, "Jeb is so wrong, Jeb is absolutely so wrong." Trump's response to the boos was to reference the "lobbyists" in the audience, and state that he had none. A question then went to Ted Cruz before the cameras turned back to Bush and Trump and the subject wound its way to 9/11 and what Trump asserted were George W. Bush's national security failings.
"The World Trade Center came down during your brother’s reign. Remember that." Bush swung back, saying he was "sick and tired of [Trump] going after my family. While Donald Trump was building a reality TV show, my brother was building a security apparatus to keep us safe." More boos came as Trump responded, saying, "How did he keep us safe" when the World Trade Center came down? "I lost hundreds of friends."