Former U.S. Attorney Preet BhararaPreetinder (Preet) Singh BhararaGeorge Conway: 'Garbage' White House defense 'virtually guarantees' Trump impeachment Epstein death sparks questions for federal government Debate competes with 'Bachelorette' finale: 'Who gets the rose?' MORE said Friday that special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network MORE's team is likely "looking at everyone up to" President TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' MORE himself as it investigates Russia's meddling in the 2016 election.

"I think the Mueller team is looking at every member of the campaign," Bharara said on CNN. "I think they're looking at every member of the transition team. I think they're looking at everyone up to the president of the United States himself."

Bharara, who served as the U.S. Attorney for the Southern District of New York, was ousted by Trump officials in March after he refused the Justice Department's demand to step down from his post.

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Bharara's comments came hours after Trump's first national security adviser, Michael Flynn, pleaded guilty to lying to FBI agents about his contacts with Russian Ambassador Sergey Kislyak in the month before Trump took office.

According to court documents, Flynn lied to investigators when he told them he did not lobby Kislyak on a United Nations Security Council vote condemning Israeli settlements.

The documents also say that Flynn lied when he told the FBI that he did not urge Kislyak to "refrain from escalating the situation" in response to sanctions implemented by the Obama administration in response to Russia's election meddling.

The documents claim that Flynn's communications with Kislyak in December 2016 were directed by senior Trump transition officials.

Multiple media outlets reported Friday that Trump's son-in-law and senior adviser Jared KushnerJared Corey KushnerCareer State official warned about Biden's son: report Buttigieg knocks Trump as a 'walking conflict of interest' Biden's weak response to Trump is a lesson for Democratic candidates MORE is the "very senior transition official" referenced in the documents. He reportedly directed Flynn to lobby foreign governments, including Russia, on the Security Council Vote.

Another transition official, former deputy national security adviser K.T. McFarland, was identified as another "senior transition" official referenced in the documents, according to The Associated Press. She reportedly discussed with Flynn what he would communicate to Kislyak regarding the sanctions.

In pleading guilty on Friday, Flynn became the first person to have worked in the Trump White House to face charges in Mueller's investigation.