Rep. Alexandria Ocasio-Cortez attacked Joe Biden for claiming that Sen. Bernie Sanders’s criticisms of his record were untrue.

Biden, 77, and Sanders, 78, have been jostling for the top spot in the Democratic presidential primary by ripping each other’s records. Sanders has been drilling Biden for his support of the Iraq War and cuts to Social Security. The Vermont senator released an attack advertisement against Biden that featured a clip of the former vice president discussing spending cuts to Social Security and Medicare.

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