Former federal prosecutor Elliot Williams said Wednesday that recent sentencings in 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's probe into Russia's election meddling show that the investigation could be nearing its end.

"Because of the fact that we are beginning to see sentencings, those tend to be a sign that things are wrapping up because you only sentence people when they're done with their cooperation," Williams, who also worked in the Justice Department during the Obama administration, told Hill.TV's Krystal Ball and Buck Sexton on "Rising."

Mueller's team has indicted or reached plea deals with 33 people, including onetime Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, former national security adviser Michael Flynn and former longtime Trump lawyer Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE.

London-based lawyer Alex van der ZwaanAlex van der ZwaanEx-federal prosecutor says sentencings signal Mueller probe likely approaching end MORE was the first person in the investigation to be sentenced earlier this year, and former Trump campaign foreign policy 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 was sentenced in September.

Flynn on Tuesday took a U.S. district court judge up on an offer to postpone his sentencing for lying to FBI agents about his contacts with former Russian Ambassador Sergey Kislyak while serving as President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's top national security adviser.

"This Flynn thing yesterday was interesting because someone who was about to be sentenced, who we thought was done with his cooperation now is getting sentenced later on out in time," Williams said Wednesday.

"Now [Jerome] Corsi and [Roger] Stone, for instance, haven't either pled or entered agreements or been tried or whatever, so maybe they're still out there," he added. "But for the most part, we're probably closer to the end than we are to the beginning."

— Julia Manchester