Supporters of President Donald Trump — particularly his attorney Rudy Giuliani — have argued that Trump’s much-criticized July 25 phone call with the current president of Ukraine, Volodymyr Zelensky, was appropriate because Biden had been corrupt in pushing Poroshenko to get rid of the state prosecutor. Giuliani alleged that Biden was attempting to help his son, Hunter Biden, who had financial connections in Ukraine. Giuliani doubled down on those points in a contentious interview Sunday on CNN’s “State of the Union,” arguing that Viktor Shokin, the former prosecutor, has been falsely tarred.

Shokin left office in March 2016. Biden has aggressively denied the allegation that he did anything inappropriate.

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Saying he didn’t “recall all of the specifics about the specific individuals,“ Cameron didn’t directly address what Biden may or may not have said as President Barack Obama’s vice president, but said that the West was working hard at that time to get Ukraine to clean up its notoriously corrupt government. The West was heavily involved in Ukraine at the time because of its ongoing conflict with Russia, which had seized Crimea from Ukraine in 2014, an invasion roundly condemned by the international community.

Defenders of Biden have said that what Biden did in pushing Ukraine’s leadership was in line with those goals.

“Ukraine cannot afford the people to lose hope again,” Biden said in addressing the topic of corruption in a December 2015 visit, referring to corruption as a “cancer.“

Cameron also told Zakaria he thought the Trump administration made a mistake in pulling out of the Iran nuclear agreement — which was negotiated during his tenure as prime minister, with his assistance — without a new deal in place.