US intelligence officials quoted by the New York Times claim members of the Trump campaign had repeated contacts with senior Russian intelligence officials.
The FBI is investigating those alleged contacts, as well as the hacking of the DNC. The disclosure follows leaks revealing former NSA director Michael Flynn's conversation with the Russian ambassador.
The New York Times quotes two unnamed US intelligence officials. The story broke about 24 hours after Michael Flynn's resignation as National Security Advisor. He's alleged to have talked with the Russian ambassador to the US about the Obama Administration's sanctions prior to President Trump taking office.
Meanwhile, members of Congress from both parties are calling for a Senate investigation. The FBI launched a probe months ago.
Olga Ivshina, correspondent with the BBC’s Russian Service; she tweets @oivshina