George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, who pleaded guilty to lying to federal agents about his contacts with Russia-linked individuals, has begun his two-week prison term.

Papadopoulos’s wife, Simona Mangiante Papadopoulos, confirmed to The Hill on Monday afternoon that the former Trump campaign aide has entered prison, saying it “was heartbreaking.”

His sentence, which he received earlier this year, comes after he unsuccessfully sought to postpone his prison term.

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U.S. District Court Judge Randy Moss on Sunday denied Papadopoulos’s two motions to delay his sentence, stating that he failed to show that a delay is “warranted,” according to court documents.

Moss cited Papadopoulos’s decision to enter a guilty plea with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, which essentially waived his right to appeal his sentence — a step that is necessary to qualify for a bail pending appeal.

Moss also wrote that the defendant's effort to challenge Mueller's authority, which is currently pending in a separate circuit court case involving longtime GOP operative Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE, was not likely to succeed since other courts have already ruled his appointment is lawful.

A lawyer for Papadopoulos, Caroline Polisi, described the decision as another ruling in an “inequitable case.”

“The Court's decision not to stay Mr. Papadopoulos's incarceration is an unfortunate result in an inequitable case. At sentencing, Judge Moss himself acknowledged that he did not see ‘any reason in the record to conclude that Mr. Papadopoulos had any desire to aid Russia in any way, to do anything that was contrary to the national interest,’” Polisi said in a statement to The Hill.

“Nevertheless, for practical reasons, Mr. Papadopoulos has decided not to appeal the Court's decision or move to overturn his plea. Given the immense power of the Special Counsel's Office and the costs to Mr. Papadopoulos of continuing to fight, he will serve his sentence, and hopes to move on with his life,” her statement continues.

Papadopoulos, who cooperated with Mueller’s team, has become increasingly critical of the Russia investigation since his sentencing in September.

While he showed remorse as the ruling was being handed down, he has since claimed that the Obama administration and other western intelligence agencies wanted to hurt the Trump campaign by entrapping him and others tied to the Republican presidential candidate.

Last month, Papadopoulos said he was considering pulling out of the plea agreement with Mueller — a move he did not act on.

“Still can’t believe the day I am going to a federal prison camp, mainstream media says am going for my Russia contacts. I have never met a single Russian official in my life," Papadopoulos tweeted early Monday.

"I have, however, met many western intel sources—Joseph Mifsud—who people still call ‘Russian.’ Facts. USA,” he continued, referring to a Kremlin-linked professor who took an interest in the young foreign policy adviser.

Papadopoulos has claimed that Misfud is a British intelligence official rather than a Russian one — a claim he has made without offering concrete evidence.

Papadopoulos emerged as a key figure in the federal counterintelligence investigation into Russia's election interference after he told a top Australian diplomat during the 2016 race that the Russians had dirt on Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE’s campaign in the form of thousands of emails — a statement he learned from Misfud and that he made before WikiLeaks began releasing hacked emails from the Democratic National Committee.

He has also been sentenced to 200 hours of community service and fined $9,500.