Donald Trump #39;morally unfit to be president: ex-FBI chief James Comey

Comey, who was unceremoniously fired by the US president in May last year, in a wide-ranging interview to ABC News also warned that if Trump ever tries to sack special counsel Robert Mueller, then it would be his "most serious attack yet on the rule of law" and causing "tremendous damage" to the country#39;s institutions.

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