George Papadopoulos former Trump campaign foreign policy adviser would be behind the bars this Monday.
Papadopoulos will serve a 14-day sentence, then be on probation for a year. He will also pay a $9,500 fine and participate in community service at a federal minimum-security camp in Oxford, Wisconsin.
He pleaded guilty last year to lying to federal agents about his interactions with Russian intermediaries during the 2016 presidential campaign.
Papadopoulos's legal team had sought a postponement of his prison term until an appeals court ruled in a separate case challenging the constitutionality of special counsel Robert Mueller's appointment.
Randy Moss, a federal judge of the US District Court for the District of Columbia, rejected this request.
Papadopoulos says he is willing to publicly testify to Congress once his prison sentence ends.
Caroline Polisi, Papadopoulos' defense lawyer said in a statement Monday he had decided not to appeal Moss' decisions and will not try to exit his guilty plea agreement.