Numerous emails that Mueller's investigators have now include national security discussions about possible Trump global aims as well as candid assessments of candidates for top government posts, said those familiar with the transition.
The special counsel probing whether US President Donald Trump's campaign colluded with Russian Federation has unlawfully received tens of thousands of emails, a lawyer for Trump's transition alleges, according to US media.
Trump transition lawyer Kory Langhofer believes the emails were given to Mueller's team unlawfully..
The twist: The sources say that transition officials assumed that Mueller would come calling, and had sifted through the emails and separated the ones they considered privileged.
Trump's transition team used facilities of the GSA, which helps manage the USA government bureaucracy, in the period between the Republican's November presidential election victory and his inauguration in January. Flynn was sacked by Trump in February for misleading senior administration officials about his contacts with Russia's ambassador to the U.S.
Asked for comment, White House spokeswoman Sarah Sanders said: "We continue to cooperate fully with the special counsel and expect this process to wrap up soon".
"Additionally, certain portions of the [transition] materials the Special Counsel's Office obtained from the GSA, including materials that are susceptible to privilege claims, have been leaked to the press by unknown persons". "There is absolutely no collusion".
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The letter was sent to the US Senate Committee on Homeland Security and Government Affairs, and the US House Committee on Oversight and Government Reform.
Langhofer also said that a GSA official appointed by Trump in May had assured the transition in June that any request for records from Mueller's office would be referred to the transition's attorneys.
Late Saturday, Mueller's spokesman, Peter Carr, said the special counsel's office has followed the law when it has obtained documents during its investigation.
Among those officials was former National Security Adviser Michael Flynn, who pleaded guilty to charges of lying to Federal Bureau of Investigation (FBI) agents about his contacts with Russian officials earlier this month.
Langhofer, the Trump transition team lawyer, wrote in his letter that the GSA's transfer of materials was discovered on December 12 and 13.
The letter blames the agency's counsel, Lenny Loewentritt, and his "career GSA staff" for turning over thousands of unredacted emails without notifying the transition team. Langhofer argues the communications were not theirs to share.