FBI Director James Comey confirms probe into any Trump Moscow links

Probe includes "whether any crimes were committed"

Comey says FBI has "no evidence" Barack Obama wiretapped Donald Trump

Head of NSA says "nonsense" that British intelligence involved in Trump wiretapping

Michael Rogers says allegation "frustrates a key ally"

Donald Trump trolls FBI director

The director of the FBI took the extraordinary step of publicly confirming the bureau has launched a criminal investigation into suggestions of collusion between Russia and Donald Trump's campaign during last year's presidential election.

James Comey also shot down claims by President Trump that his predecessor Barack Obama had him wiretapped, saying the FBI had "no information" to support the allegations.

It came as Admiral Mike Rogers, director of the National Security Agency, declared it was "nonsense and ridiculous" for the Trump administration to have suggested that GCHQ was used by Mr Obama to spy on Trump Tower in New York.

