In an appearance on "Hannity" with host Sean Hannity, Graham said that the former vice president and 2020 presidential candidate will face judgment in his campaign as the presumptive Democratic nominee throughout the next few months.
"It was Joe Biden pushing to get out of Iraq against sound military advice. It was Joe Biden, according to Leon Panetta, that opposed the raid that actually killed Bin Laden. Joe Biden called Donald Trump a racist, a xenophobic person, when he instituted the travel ban against China. Joe Biden has been wrong across the board on things that really matter," he remarked.
"So, we're going to have a comparison and contrast campaign about Joe Biden's judgment over time versus that of President Trump's judgment over time," he predicted.
"The caliphate came about because Joe Biden advised President Obama: 'We need to get out of Iraq.' And, he was proud of that. He actually went to the ceremony when we left," Graham added.
"The bottom line is, without Joe Biden, there would be no ISIS. Without Donald Trump, the caliphate would still exist. Donald Trump is the one that killed Soleimani -- the biggest terrorist of all in Iran -- and Joe Biden opposed that," he told Hannity.
"So, I can't wait to compare and contrast the judgment of President Trump against that of Vice President Biden on foreign policy," Graham concluded. "This will be a knockout. This will be over in round one on the debate stage."