Former FBI agent Peter Strzok, a favourite punching bag for Donald Trump and right-wing media, has said he still believes Russia and its president, Vladimir Putin, have kompromat on the president that prevents him from serving the “national interest” of the US.

“I believed at the time in 2016 and I continue to believe that Donald Trump is compromised by the Russians,” Mr Strzok said in an interview on NBC's “Meet the Press.”

“And when I say that I mean that they hold leverage over him that makes him incapable of placing the national interest, the national security ahead of his own,” said Mr Strzok, who led the FBI’s investigation into former Secretary of State Hillary Clinton’s use of a personal email server in violation of government security protocols.

Two men have blown themselves up near the US embassy in Tunisia’s capital, Tunis, killing one policeman and injuring several others, officials confirmed.

The Interior Ministry said the two militants died carrying out the attack and five policemen sustained injuries, while a civilian suffered minor injuries.

State news agency TAP reported the Interior Ministry as saying one of the security officers later succumbed to his injuries.