It was one of the most shocking moments of the 2024 presidential campaign. President Joe Biden, at times appearing incoherent and confused, effectively ended his hopes of reelection as he stumbled through a debate against rival Donald Trump. It marked the beginning of the end of his campaign. He was ultimately replaced by Vice President Kamala Harris - a last-minute switch that failed to deliver the Democratic Party the White House.

To many voters, it was a shocking turn of events. But, as a new book argues, for White House and Biden family insiders, it was the public exposure of a secret they had long been trying to keep. Publicly, Biden’s team have refuted claims that he was unfit for reelection, insisting that “he was a very effective president.” But the question remains: did Team Biden cover up his declining health?

In an interview that was recorded before the announcement of Joe Biden’s cancer diagnosis this weekend, Matt Frei speaks to CNN anchor Jake Tapper about his explosive new book, Original Sin, which examines the former president’s apparent cognitive decline and includes testimony from White House insiders who claim there was a deliberate “cover-up” to keep the truth from the American people.