FBI's James Comey: from Clinton bugbear to thorn in Trump's side?

Eight months ago, James Comey hampered Hillary Clinton’s White House bid with a damning assessment of her email practices.
On Monday, the powerful FBI chief lobbed another bombshell into the world of US politics – this time directed at the sitting president, Donald Trump.
In a high-stakes congressional hearing followed live by millions in America and around the world, Comey flatly rejected Trump’s explosive claim that he was wiretapped by his predecessor Barack Obama.
Comey delivered his assessment without a blink, telling lawmakers neither the FBI nor the Justice Department had evidence to support such allegations.
Watch: FBI director James Comey confirms Russia investigation
Intensely concentrated, with furrowed brow, the towering Comey – he stands two metres tall – took the heat during a marathon first public hearing on the issue of Russian meddling in last year’s election, and Trump’s unsubstantiated allegations of wiretapping.