Did the president of the United States pressure the director of the FBI to put his personal reputation ahead of national security? Did Donald Trump know what he was saying when he exchanged with James Comey on February 14 about his national security advisor's ties to Russia? As Comey testifies before the Senate intelligence committee, we ask if this - as Barack Obama's head of national intelligence said this week – could be bigger than Watergate.
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Produced by Charles WENTE, Selina SYKES and Van MEGUERDITCHIAN.