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 personal attorney Ty Cobb said Tuesday that special counsel Robert Mueller has finished interviews with all the White House staff members he intends to speak with, according to multiple media reports.

The special counsel’s office declined to comment, however.

Cobb has previously said he believes the Mueller probe could be over soon.

In August, he told Reuters he would be "embarrassed" if the probe was continuing past Thanksgiving. Weeks later, Mueller announced former national security adviser Michael Flynn had pleaded guilty to making false statements to the FBI.

Other observers have raised questions about whether Cobb's view is too rosy, given the all-star team Mueller has assembled to go after Trump. Other special counsel probes have also not ended quickly, giving credence to the idea that this investigation could go on for some time.

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Mueller’s team began interviewing White House officials in September, and has in recent weeks reportedly spoken with White House communications director Hope Hicks, senior adviser Stephen Miller and White House counsel Don McGahn.

Four individuals have been indicted or pleaded guilty thus far in Mueller’s probe.

Former Trump campaign chairman Paul Manafort and his former associate, Richard Gates, were indicted in October on tax fraud and money laundering charges.

Former campaign adviser George Papadopoulos pleaded guilty to lying to the FBI earlier this year.

The possibility that Mueller's team could be seeking to turn more people against Trump, or that Flynn could have more to say, has also prompted speculation.

Trump lashed out on Twitter on Tuesday morning over the investigation, saying “Democrats have been unable to show any collusion with Russia,” and are now focusing on allegations of sexual misconduct against the president.