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Fiorina, who faced off with Trump several times during the GOP presidential primary, said in a statement Saturday that Trump "does not represent me or my party.”

"I understand the responsibility of Republicans to support their nominee. Our nominee has weighty responsibilities as well," Fiorina said. "Donald Trump has manifestly failed in these responsibilities."

"For the sake of our constitution and the rule of law, we must defeat Hillary Clinton," Fiorina said.