Papadopoulos, the first campaign aide sentenced in special counsel Robert Mueller's ongoing investigation, acknowledged that his actions hindered an investigation of national importance, a move that the judge in his case said resulted in the 31-year-old putting his own self-interest above that of his country.
The DNC's revelation came in court filings Friday in their lawsuit against Russian Federation, the Trump campaign and WikiLeaks for interfering in the 2016 presidential election.
Papadopoulos, who was sentenced in federal court in Washington, had pleaded guilty in October to lying to FBI agents about the timing and significance of his contacts, including a professor who told him the Russians had "dirt" on Trump's Democratic presidential rival, Hillary Clinton.
When Papadopoulos pleaded guilty a year ago, he pledged to help the special counsel's office with its investigation.
He also received a year of supervision, 200 hours of community service, and a $9,500 fine.
Judge Randolph D Moss said the sentence could have been higher but he sensed "genuine remorse" from Papadopolous.
Moss also said he thought it was important that his sentence send the public a message about the gravity of misleading and, "telling lies to the Federal Bureau of Investigation on matters of grave importance to the nation".
During his sentencing hearing Papadopoulos said his case should serve as a warning to others.
The president told reporters on Air Force One on Friday that "I don't know Papadopoulos".
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Prosecutors working for special counsel Robert S Mueller III had asked the judge to sentence Papadopoulos to six months in prison, saying his false statements "were meant to harm the investigation, and did so". That probe was later taken over by Mueller.
"While some in the room rebuffed George's offer, Mr Trump nodded with approval and deferred to Mr Sessions, who appeared to like the idea and stated that the campaign should look into it", Papadopoulos claimed in a pre-sentencing statement last week. "I made a terrible mistake but I am a good man", he said.
He pleaded guilty in February to lying to the FBI about his communications with Rick Gates, a business associate of former Trump campaign chairman Paul Manafort, who was also under investigation.
Defence lawyer Thomas Breen said his client was affected by Mr Trump's cries of "fake news" ahead of the interview and was torn between wanting to cooperate with investigators and wanting to remain loyal to the President.
"The defendant did not provide "substantial assistance" " after that arrest, prosecutors wrote to the judge, "and much of the information provided by the defendant came only after the government confronted him".
Breen said his client's primary interest was brokering a meeting between Trump and Putin, a move he believed the campaign supported.
"We were hoping for no jail time but two weeks is OK", Maria Stamatopoulos said.
President Donald Trump and his allies have repeatedly downplayed Papadopoulos' role on the campaign.
But he said then-senator and now-Attorney General Jeff Sessions "was actually enthusiastic".