evidence: During the campaign, Biden was highly critical of Trump’s approach to Iran, calling it a "dangerous failure" because since Washington pulled out of the JCPOA, Tehran has now "stockpiled 10 times as much enriched uranium as it had when President Barack Obama and I left office." He also said he was not naive about "the challenges the regime in Iran poses to America’s security" but added that there was a smarter way to deal with Iran.