US President Donald Trump reacted by taking an apparent swipe at the cost of the investigation into the former aide.
"The defendant's lies undermined investigators" ability to challenge the Professor or potentially detain or arrest him while he was still in the United States, ' they wrote, noting that Mr Mifsud left the USA in February 2017 and has not returned.
Papadopoulos apparently raised the possibility of setting up a meeting between Trump and Putin during a national security meeting in March 2016.
In response to Papadopoulos' claims, Sessions released a statement through his lawyer to CNN stating he "stands by his testimony".
The lies Papadopoulos told in his voluntary interview with the Federal Bureau of Investigation on January 27, 2017, prosecutors said, "undermined investigators' ability to challenge the professor or potentially detain or arrest him while he was still in the United States". In addition to the 14-day sentence, he's been fined $9,500, and ordered to complete 200 hours of community service and one year of probation. He said his client doesn't recall telling anybody connected with the Trump campaign about Mifsud's offer of Clinton dirt.
Speaking to reporters aboard Air Force One on Friday ahead of the sentencing, Trump played down his relationship with Papadopoulos.
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"I do credit the sense that he does feel remorse", Moss said.
"I hope to have a second chance to redeem myself", Mr. Papadopoulos told the judge at the sentencing hearing.
Papadopoulos soon made contact with a mysterious Maltese academic, identified as Joseph Mifsud. Papadopoulos says he had nothing to do with the leak.
Papadopoulos was pictured in March 2016 sitting at a table with Trump, then-campaign adviser Jeff Sessions who went on to become USA attorney general, and other foreign policy campaign advisers.
But he said then-senator and now-Attorney General Jeff Sessions "was actually enthusiastic". "I don't know Papadopoulos". A spokeswoman for Sessions declined to comment after Papadopoulos's filing last week.
"Judge said he believed Papadopoulos was genuinely remorseful but didn't agree to a probation sentence because he needed to send a message about the seriousness of lying to the FBI", Cheney wrote in a subsequent tweet. In part because Papadopoulos misled authorities, they said in court papers, they failed to arrest a London-based professor - suspected of being a Russian operative - before he left the United States in the following month, never to return.
With the sentence, the young man whom Trump administration officials called a "coffee boy" and whose family members have argued is caught in a spy conspiracy will become the first Trump campaign affiliate to have his criminal case reach its completion in the court system.