Making his debut appearance on Hillary Clinton’s campaign trail, Vice President Joe Biden said GOP nominee Donald Trump “would have loved Stalin.”

“This guy’s shame has no limits,” Biden told a crowd in his hometown of Scranton, PA. He noted that Trump, at a news conference last month, urged Russia to conduct a cyber attack against America when he invited Russian hackers to find and publish emails Clinton says she were deleted because they were personal.

“Russia, if you’re listening, I hope you’re able to find the 30,000 [Clinton] emails that are missing,” Trump said at a press conference. “I think you will probably be rewarded mightily by our press. … That’ll be nice.”

Atmosphere at day 3 of The Republican National Convention
Associated Press

“Even if he is joking – which he is not – that’s an outrageous thing to say,” Biden said this afternoon at the Clinton rally which was covered by the cable news outlets, though Fox News Channel broke away before Biden really got rolling on Trump.

Trump has expressed admiration for Russian leader Vladimir Putin and “showered praise on Saddam Hussein, a man who repeatedly backed terrorist attacks against Israel,” Biden told the receptive crowd of Clinton supporters.

The veep blasted Trump for telling a Florida crowd last week that President Obama founded ISIS. “That’s an outrageous statement,” Biden scoffed.

Trump last Wednesday called Obama “the founder of ISIS,” later adding that Clinton co-founded the terrorist group. Trump said Friday that his assertion was sarcasm lost on CNN,but later that same day said his claim, while sarcasm, was “not that sarcastic.”

“Let me tell you why it’s a dangerous statement,” Biden warned today. “The bad guys are listening.”

He quoted Hassan Nasrallah, leader of the Lebanese militant group Hezbollah, who last week said of Trump’s remark: “This is an American presidential candidate. This was spoken on behalf of the American Republican Party. He has data and documents.”

Said Biden: “If my son were still in Iraq, and I say to all of those who are there, the threat to their life has gone up a couple clicks … as a consequence of Trump’s outlandish comments,” which have hurt the “physical safety of our troops” and already “made our country less safe.

“Hillary has forgotten more about American foreign policy than Trump and his entire team will ever understand.”

He added: “I can say without hesitation … no major party nominee in the history of the United States of America has known less or been less prepared to deal with our national security than Donald Trump,” Biden insisted. “And what absolutely amazes me is that he doesn’t seem to want to learn it. … He doesn’t think it matters.”