Former Vice President Joe Biden and Sen. Cory Booker (D-N.J.) were going at it on Wednesday night over criminal justice reform issues in this country when Biden made a gaffe he may be regretting for hours and hours and days and days from now.

Said Biden, “The fact is that the bills that the president — excuse me, the future president of the United States — that the senator is talking about …”

He grabbed Booker’s arm and tried to lighten the moment, but it almost didn’t matter what he said after that.

Biden was embarrassed.

Booker was jubilant about that reference.

Twitter exploded.

And Biden had another gaffe now added to his long list of gaffes over the years.

Related: Biden’s in Even More Trouble Now

Booker later said, all smiles, “I’m grateful that he endorsed my presidency already.”

 Update: At the end of the debate, Biden asked voters who “agree with” him and his vision to go to “Joe 30330.” That’s not a typo. That’s what he said. What was that?

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And see these tweets on the Biden-Booker-president issue:

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This article has been updated.