Presidential hopeful Jeb Bush is slamming rival 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, saying he is "sick and tired" of the businessman's comments on his brother's time in office.

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"I could care less about the insults Donald Trumps gives me. It's blood sport for him," Bush said Saturday at the ninth GOP primary debate. "I am sick and tired of him going after my family."

Trump was asked at the event in South Carolina if he still believes former President George W. Bush should have been impeached over the Iraq War.

The real estate mogul, who said the 43rd president made mistakes, was booed by the audience after saying that the 2001 terrorist attacks happened under Bush's watch.