Did a bit of digging on the New York Review, appears to be a well respected institution with high praise from other outlets like WaPo, NYT, The Guardian, ...
Excerpt:
I have learned that a confidential White House memorandum, which is in the special counsel’s possession, explicitly states that when Trump pressured Comey he had just been told by two of his top aides—his then chief of staff Reince Priebus and his White House counsel Don McGahn—that Flynn was under criminal investigation. This memo, the existence of which I first
disclosed in December in
Foreign Policy, was, as one source described it to me, “a timeline of events [in the White House] leading up to Flynn’s resignation.” It was dated February 15, 2017, and was prepared by McGahn two days after Flynn’s forced resignation and one day after Trump’s meeting with Comey. As I reported, research for the memo was “primarily conducted by John Eisenberg, the deputy counsel to the president and legal adviser to the National Security Council,” who, in turn, was “assisted by James Burnham, another White House counsel staff member.”
During my reporting, I was allowed to read the memo in its entirety, as well as other, underlying White House records quoted in the memo, such as notes and memos written by McGahn and other senior administration officials. My reporting for this story is also based on interviews with a dozen former and current White House officials, attorneys who have interacted with Mueller’s team of investigators, and witnesses questioned by Mueller’s investigators.
In arguing in their January 29 letter that Trump did not obstruct justice, the president’s attorneys Dowd and Sekulow quoted selectively from this same memo, relying only on a few small portions of it. They also asserted that even if Trump knew there had been an FBI investigation of Flynn, Trump believed that Flynn had been cleared. Full review of the memo flatly contradicts this story.
(Long article, I only copied the opening paragraph and some excerpts above)
https://www.nybooks.com/daily/2018/07/31/what-trump-knew-and-when-he-knew-it/
Flynn, Comey, and Mueller: What Trump Knew and When He Knew It
Previously undisclosed evidence in the possession of Special Counsel Robert Mueller—including highly confidential White House records and testimony by some of President Trump’s own top aides—provides some of the strongest evidence to date implicating the president of the United States in an obstruction of justice. Several people who have reviewed a portion of this evidence say that, based on what they know, they believe it is now all but inevitable that the special counsel will complete a confidential report presenting evidence that President Trump violated the law. Deputy Attorney General Rod Rosenstein, who oversees the special counsel’s work, would then decide on turning over that report to Congress for the House of Representatives to consider whether to instigate impeachment proceedings.
