MAR 20, (DNA) – The heads of the FBI and NSA are to testify before Congress about possible links between Russia and President Donald Trump’s election campaign.

They will also address Mr Trump’s claim that he was wiretapped by Barack Obama.

FBI director James Comey and the NSA’s Admiral Mike Rogers will speak at a rare open hearing of the congressional intelligence committee.

Russia denies trying to influence the election, while Mr Trump denounced the investigation as a “total witch hunt”.

In January, US intelligence agencies said they believed Kremlin-backed hackers had broken into the email accounts of senior Democrats and released embarrassing ones in order to help Mr Trump defeat Hillary Clinton.