Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE was repeatedly booed by the GOP presidential debate audience Saturday in South Carolina when he criticized former President George W. Bush for failing to keep America safe on Sept. 11, 2001.

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"How did he keep us safe when the World Trade Center went down?" the party front-runner said to boos.

"I lost hundreds of friends, the World Trade Center went down during the reign of George Bush. He kept us safe? That is not safe."

In an audio recording of Clinton from the day before the 2001 attacks that wasn't released until 2014, he admitted that he had the chance to kill bin Laden while in office but decided against the strike out of concern for hundreds of civilian casualties.