Prosecutors say Papadopoulos was solicited by a professor with ties to Russian intelligence, Joseph Mifsud, who told the young Trump aide that the Russians possessed incriminating information about Hillary Clinton in the form of "thousands of emails" - before it was widely and publicly known that Russia had stolen Democratic emails.
Prosecutors had asked Judge Randolph Moss in U.S. District Court for the District of Columbia to impose a prison sentence of up to six months, saying that Papadopoulos' lies impeded their investigation and that he did not cooperate.
Moss said that while Papadopoulos lied for selfish reasons and did real harm to the government's efforts to carry out its investigation of Russian meddling, he was moved by what he called the defendant's "genuine remorse about what he did".
"I hope to have a second chance to redeem myself", Mr. Papadopoulos told the judge at the sentencing hearing.
According to Bloomberg News, the committee indicated that an investigator had been used to find Mifsud, who had disappeared for months, and was told the Maltese professor may be dead. Papadopoulos learned his fate Friday in federal court in Washington. Press secretary Sarah Sanders said past year that Papadopoulos, 31, had "a minimal role, if one at all" in the campaign.
"The president of the United States hindered this investigation more than George Papadopoulos ever could", Breen said.
"Mr. Papadopoulos's offense was unquestionably serious as he made materially false statements to Federal Bureau of Investigation agents", they wrote in their sentencing memo.
Papadopoulos had pleaded guilty to the crime last October.
According to the New York Times, George Papadopoulos played a key role in sparking the FBI's probe of Donald Trump's contacts with Russian Federation after he told a diplomat that Russian Federation had dirt on Hillary Clinton. He participated in four proffer sessions, they say, and "was willing to answer any questions posed".
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Papadopoulos was once described as a "coffee boy" to the Trump campaign.
The FBI began investigating Russian's election interference after a tip that Papadopoulos had dished about his Russian connections to an Australian diplomat during a night of heavy drinking.
After Papadopoulos and his legal team left the courthouse in a black Chevy Suburban, his family members hung behind outside the courthouse.
The $28 million price tag cited by Mr. Trump is likely a reference to the cost of the Mueller probe.
Attorney General Jeff Sessions, who ran the Trump campaign foreign policy operation, has said he quickly rejected that idea when Papadopoulos raised it at a meeting in March 2016.
Papadopoulos also made a similar claim about Sessions last week in court.
"I see Papadopoulos today", he told reporters aboard Air Force One.
In response to Papadopoulos' claims, Sessions released a statement through his lawyer to CNN stating he "stands by his testimony".
"I made mistakes and I will pay for my mistakes", he said, adding, "I don't want to give up my goal of staying in politics".