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 has asked a judge for a September sentencing for former Trump campaign adviser 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.

Mueller's prosecutors and defense attorneys in a Friday court filing asked U.S. District Court Judge Randy Moss to set Papadopoulos's sentencing for Sept. 7 or for a date in October barring his availability in September, Politico reported.

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Papadopoulos, who served as a foreign policy adviser for the Trump campaign, pleaded guilty last year to making false statements to FBI agents about his contacts with pro-Russia sources during the 2016 presidential election. He is one of three Trump associates — along with businessman Richard Gates and former national security adviser Michael Flynn — to plead guilty to making false statements.

The former Trump campaign aide was arrested last July and has been out on bond since pleading guilty.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE sought to distance himself from the aide after he pleaded guilty, describing Papadopoulos as a low-level volunteer with few real responsibilities. Papadopoulos and his fiancee have pushed back on that assertion.

"Few people knew the young, low-level volunteer named George, who has already proven to be a liar. Check the DEMS!" Trump tweeted in October.

The New York Times reported last year that Papadopoulos was key in prompting Mueller's Russia investigation after he bragged to an Australian diplomat that the Russians had damaging information on Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE. The incident occurred before the Democratic National Committee was hacked by the Kremlin in 2016.

Australian government officials tipped off the FBI to Papadopoulos's remarks, sparking the now yearlong special counsel probe into possible ties between the Trump campaign and Russia.