His case was the first to detail a member of the Trump campaign having knowledge of Russian efforts to interfere in the 2016 presidential election while it was ongoing.
Papadopoulos acknowledged that he had lied to investigators about contacts with a Kremlin-linked professor who informed him in April 2016 that the Russians had "dirt" on Hillary Clinton and "thousands of emails".
When Papadopoulos pleaded guilty past year, he pledged to help the special counsel's office with its investigation.
Trump criticized the investigation and the Justice Department on the day he was inaugurated, Breen told U.S. District Judge Randolph D. Moss.
They said prosecutors have not provided any proof that Papadopoulos "actually harmed the investigation as alleged".
Outside the courthouse Friday, Breen said Papadopoulos didn't recall ever telling anyone in the campaign about the fact that Russian Federation had dirt on Clinton in the form of emails.
According to Politico's Kyle Cheney, the Papadapoulos' lawyer blamed Trump saying, "The president of the United States hindered this investigation more than George Papadopoulos ever could", citing the president's attacks on the investigation as a "witch hunt" and "fake news".
Serena dominates Sevastova to reach second straight Grand Slam final
Serena Williams is just one match away from a record-tying 24th Grand Slam title. So big, in fact, that she was too nervous to talk to him until recently.
Apple: Consumers Will Pay up for Big Screens
New photos reveal some of the fancier color options buyers will be able to choose from, including red and blue. Now in a another set of leaks coming from Germany, prices of the iPhone Xs series have been revealed online.
Overbridge collapses in south Kolkata. Several feared trapped
Televised images from the accident site showed a section about 30m long that had dropped to the ground, reported Associated Press. The bridge collapse hit traffic movement to and from vast areas in south-west Kolkata and adjacent South 24 Parganas district.
But in a court filing last month, prosecutors said Papadopoulos ultimately did little to aid their work.
Papadopoulos was the first to plead guilty in Mueller's probe.
While this chapter of the Mueller investigation concludes for Papadopoulos, his testimony and information he provided as part of his plea deal could mean trouble for others in Trump's circle, including Mr. Trump himself.
"My entire life has been turned upside down, I hope to have a second chance to redeem myself", he said.
The sentencing, coming almost one year after he pleaded guilty to lying to federal agents, ends an important yet mysterious story line in the examination of whether anyone from Trump's team conspired with Moscow to influence the presidential election.
The Chicago native was a London-based petroleum analyst before he joined the Trump campaign in March 2016 as a volunteer foreign policy adviser. He had discussed with those foreigners the possibility of a foreign trip where Donald Trump could meet Vladimir Putin. Explaining his sentence, Moss also looked to Alex Van Der Zwaan's sentence of 30 days in prison, and noted how Van Der Zwaan was a lawyer and expressed far less remorse to the judge at his sentencing compared to Papadopoulos.
"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".
In subsequent campaign communications, Papadopoulos was encouraged to pursue a Putin-Trump meeting.