A father who identified himself as "Jared" spoke with the Bidens about his children, then, as the call ended, said, "Let's go, Brandon."
The phrase is a vulgar insult that has become code for the phrase, "F--- Joe Biden." It stems from a reporter misinterpreting a chant after a NASCAR race and is popular among conservatives opposed to the president.
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Biden responded by repeating the phrase. "Let's go, Brandon," he said. "I agree."
The first couple then moved on to the next callers.