Bernie Sanders, the ex-Democratic presidential candidate points a question to current premier of his country and his networks in Moscow, right after the rising of squabble of Russian interference in 2016 US election.
According to US government, Russian intelligence tried to aid Donald Trump before election campaign in the last summer which probably include the email hacking of Hillary Clinton's party members.
And even when Mr Obama dislodged many Russian diplomats, paying for interference in US election while Vladimir Putin didn't go for any retaliation.
Though, Mr Trump had far long refused to accept any claim that Russia was ever involved with him before or during election and so did Moscow.