Zapped by U.S. Senator Cory Booker (D-NJ) over a comment he made about working in the senate with segregationists, former Vice President Joe Biden refused to say he was sorry and hit back with a demand that Booker apologize.

When asked directly if he would offer an apology as Booker suggested he should, Biden said, “Apologize for what?”

He added, “Cory should apologize.”

According to The Daily Caller, “Biden communications director Symone Sanders made the case for her boss in terms similar to his, tweeting, ‘@JoeBiden did not praise a segregationist. That is a disingenuous take. He basically said sometimes in Congress, one has to work with terrible or down right racist folks to get things done. And then went on to say when you can’t work with them, work around them.'”

Booker promptly hit back.

“I’ve spent my entire career speaking truth to power,” the New Jersey senator tweeted. “And I’ll never apologize for doing that, certainly not when I’m running to beat Donald Trump and bring this country together.”