Prosecutors working for Justice Department special counsel Robert Mueller said Papadopoulos undermined their investigation and deprived them of a chance to ask a professor of diplomacy based in London how he knew Russians had obtained the "dirt" on Trump's rival, Hillary Clinton, in the form of thousands of emails.
Twelve Russian intelligence officers were indicted by a federal grand jury on July 13, accused of hacking Democratic Party computer networks in 2016, in the most detailed US accusation yet that Moscow meddled in the presidential election to help Trump.
In asking the court for leniency, Papadopoulos said he made "a bad mistake, for which I have paid a awful price, and am deeply ashamed", and that he was motivated to lie to the Federal Bureau of Investigation try to "create distance between the issue, myself, and the president".
Papadopoulos pleaded guilty in October to lying to the Federal Bureau of Investigation about his dealings with Joseph Mifsud, a London-based professor who told him in 2016 that Russian Federation had damaging information on President Trump's campaign rival, Hillary Clinton.
In court Friday, prosecutor Andrew Goldstein said Papadopoulos' cooperation "didn't come close to the standard of substantial assistance". He was the first to plead guilty in Mueller's probe and is now the first Trump campaign adviser to be sentenced.
As part of his sentence, Papadopoulos also will have one year of court supervision, 200 hours of community service and was fined $9,500.
He admitted previous year to lying to the FBI about those contacts with Russians and Russian intermediaries, false statements that prosecutors say caused irreparable harm to the investigation during its early months.
According to Bloomberg, the DNC said it believed all of the defendants in the case had been served, with the exception of Mifsud.
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"The president of the United States hindered this investigation more than George Papadopoulos ever could", Breen said.
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".
Papadopoulos was the first to plead guilty in Mueller's probe.
Papadopoulos apparently raised the possibility of setting up a meeting between Trump and Putin during a national security meeting in March 2016.
The conversations actually occurred after he was brought on as a foreign policy adviser.
Prior to a campaign rally ahead of of Papadopoulos' sentencing, the president sought to distance himself from his one time campaign advisor. "I made a bad mistake", he remarked. At the time of the F.B.I. interview, he said, he was being considered for a job in the Trump administration and was concerned about where the escalating investigation might lead.
That account conflicts with what Sessions, now attorney general, testified before Congress.
"We don't talk politics", he said.
President Donald Trump and his allies have repeatedly downplayed Papadopoulos' role on the campaign.