Zaid, a veteran Washington lawyer who handles security clearances, said it was highly unlikely that the special counsel would uncover evidence of improper foreign entanglements and not flag it for security officials.
After more than 12 months of background checks and three months of diminished access to classified information, Trump senior adviser and son-in-law Jared Kushner has finally received permanent security clearance.
The Mueller probe has also hung over Kushner's status in the White House, in part because some of the matters under investigation relate to his role during the campaign and the transition, including contacts with Russians, as well as events that occurred in the early months of the Trump presidency, such as the firing of former FBI Director James Comey.
Kushner, who maintains a wide-ranging White House portfolio that includes leading the administration's Middle East policy, lost his clearance under a new set of White House procedures implemented after a top White House aide, Rob Porter, was permitted to remain in his position for months after the Federal Bureau of Investigation uncovered allegations of spousal abuse against him.
The resolution of his clearances does not guarantee that Mr. Kushner faces no legal jeopardy.
The attorney, Abbe Lowell, made the revelation to The New York Times, which also reported that Kushner had been granted a permanent security clearance after more than a year of vetting by the Federal Bureau of Investigation.
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Kushner's lawyer, Abbe D. Lowell, said the granting of the permanent security clearance vindicated his client and the stance that had been stated by the White House.
"I would say it is the definition of cooperation", Lowell said, pointing to Kushner's willingness to provide documents to the special counsel and to return for another interview when Mueller's team requested one. Lowell said that akin to other staff members of the White House who have reportedly attempted to answer all questions posed by the special prosecutor's team, Kushner did everything in his power to answer truthfully and expedite the "conclusion of the investigations". "Having completed all of these processes, he is looking to continue to do the work the President has asked him to do".
Donald Trump's son-in-law is presumed to have been granted a level of clearance known as Top Secret/SCI that would allow him to see the president's daily security briefing and other closely guarded documents.
Federal Bureau of Investigation background checks for security clearances routinely examine an applicant's financial holdings and foreign contacts.
Kushner attended a meeting in June 2016 with a Russian at Trump Tower during the campaign in an attempt to get disparaging information on Hillary Clinton, and he attempted to set up a "back channel" to the Kremlin during the presidential transition.
Asked whether Kushner is fully cooperating with Mueller's office, Lowell said, "I don't know that anybody could be cooperating with them more".