He was also the first to detail a member of the Trump campaign having knowledge of the Russian efforts to meddle while it was going on.
Trump criticized the investigation and the Justice Department on the day he was inaugurated, Breen told U.S. District Judge Randolph D. Moss.
'In some ways it constitutes a calculated exercise of self interest over the national interest, ' the judge said.
In addition, they said Papadopoulos did not provide "substantial assistance" and only came clean after he was confronted with his own emails, texts and other evidence. "Decisions", Papadopoulos tweeted late last month, apparently in reference to the possibility that he might rescind his guilty plea.
"14 days for $28 MILLION - $2 MILLION a day, No Collusion. A great day for America!" Mifsud left the United States and not returned, after the Federal Bureau of Investigation found him in the US on February 11, 2017, about two weeks after Papadopoulos's first interview.
Papadopoulos, who was a foreign policy advisor to Mr Trump, relayed to the then Republican presidential candidate that he had been told by a Maltese academic, Joseph Mifsud, that he had "dirt" on rival Hilary Clinton.
He later attempted to use his links to the professor and Russian nationals to attempt to set up a meeting between Trump and Russian President Vladimir Putin.
The memo went on to say that Papadopoulos was "ashamed and remorseful", but he did not always seem that way on social media.
"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.
He said Papadopoulos' deception required investigators to scour more than 100,000 emails and gigabytes of data to reconstruct the timeline of his contacts with Russians and Russian intermediaries.
Papadopoulos related the talk of Democratic emails to an Australian diplomat during what The New York Times described as a night of heavy drinking at an upscale London bar in May 2016.
"Papadopoulos misled investigators to save his professional aspirations and preserve a perhaps misguided loyalty to his master", the lawyers wrote.
Sessions has claimed he opposed the idea, but Papadopoulos continued to discuss the idea with top campaign officials over the following months.
"The president of the United States hindered this investigation more than George Papadopoulos ever could", Breen said.
Breen described his client as a "patriot", who wasn't trying to help Russian Federation. A spokeswoman for Sessions declined to comment after Papadopoulos's filing last week.
Papadopoulos said Trump gave "a sort of a nod" when he raised the idea of the meeting, but that Sessions was "actually enthusiastic" about it taking place.
Speaking to reporters aboard Air Force One on Friday afternoon, Trump distanced himself from Papadopoulos. We have seen no entrapment.
Breen told a rapt courtroom that Papadopoulos has already faced his penalty over the past year, and realized he needed to disavow the Trump administration in favor of the truth.
"We don't talk politics", he said.