Michael Flynn, former US national security adviser and a senior member of the Trump campaign team, admitted that he gave false statements to the FBI about contact with Russia’s ambassador at the time, Sergei Kislyak.
Mr Flynn has agreed to cooperate with the investigation into alleged interference in the 2016 election by the Russians.
The statement of offence released by the court states that other top members of the transition team also knew of Mr Flynn’s contact with the Russian ambassador.
Mr Flynn’s contact with the ambassador was in regards to discussions around a UN resolution on Israel, as well as Obama-imposed sanctions against Russia.
Despite supposed ties to high-ranking officials in the Trump team, the White House has stated that the guilty plea only affects Mr Flynn.
“Nothing about the guilty plea or the charge implicates anyone other than Mr Flynn,” said Ty Cobb, a White House attorney in a statement.
Both Moscow and Donald Trump have denied any collusion or attempt by the Russians to influence the US election.
US intelligence agencies, however, believe that the Russians did make an attempt to meddle in the election, to get Mr Trump elected.