Bernie Sanders whacked Joe Biden over super PACs and Social Security during Sunday night’s 11th 2020 Democratic primary debate, sparking an at times angry exchange between the septuagenarian candidates.

Sanders, 78, got testy after Biden, 77, argued that Americans aren’t interested in the socialist Vermont lawmaker’s political revolution amid the coronavirus pandemic.

“We have problems we have to solve now. Now,” Biden said. “What’s the revolution going to do? Disrupt everything in the meantime?”

Sanders responded by attacking US healthcare and political systems — and blasting Biden over the super PAC supporting his candidacy.

“You need to take on Wall Street. You need to take on the drug companies and the insurance companies and the fossil fuel industry,” Sanders said. “You don’t take campaign contributions from them. You take them on and create an economy that works for all.”

Biden scoffed and shot back that he beat Sanders in recent primaries and caucuses with less money.

“Bernie’s implication is somehow I am being funded by millionaires,” Biden said. “In the last Super Tuesday and before that, Bernie outspent me 2, 3, 4, 5, 6 to 1 and I still won. I didn’t have any money. And I still won.”

But Sanders didn’t let the issue go — calling on Biden to disavow the super PAC, which he said was “running negative ads” against him.

Biden shot back: “Speaking of negative ads, my lord Bernie, you’re running an ad saying I’m opposed to Social Security. It’s a flat lie.”

Sanders then laid into Biden for his past openness to making cuts to social security.

“I am saying that you have been on the floor of the Senate time and time again, touting the need to cut Social Security, Medicare and veterans’ programs,” Sanders said to Biden.

“That is not true,” Biden snapped back.

That’s when Sanders, sounding every bit his age, urged viewers to “go to the YouTube” to look up past comments Biden made on the topic.

“America, go to the YouTube right now,” Sanders said.

He then turned to Biden and said; “You were not a fan of the balanced budget amendment? Why don’t you just tell the truth now? We all make mistakes.”

Biden said he was willing to put changes to Social Security on the table as he debated funding for other issues — “But we did not cut it.”

“I know,” Sanders shot back, “because people like me helped stop that.”

Biden said Sanders supporters had been taking his comments out of context and asked viewers to visit his website, which he said sets the record straight.

Despite the contentious exchange, both candidates pledged to fully support whoever wins the nomination.