(CNN) Special counsel Robert Mueller's prosecutors have responded to the latest proposal from President Donald Trump's legal team regarding a possible interview with the President, sources familiar with the matter said Tuesday.

The discussions for a possible presidential interview are continuing. The focus of the letter was an emphasis on written questions for the President, according to one source. Another source said Mueller's letter stated the written responses would pertain to questions regarding potential conspiring between Trump associates and Russia. The response left unresolved the issue of an in-person interview and questions regarding Trump's time in office, the source added.

The response was received on Friday, three-and-a-half weeks after the President's lawyers submitted their last offer. Trump's team hasn't responded to the latest Mueller proposal.

The news of the Mueller team's response comes the same day as excerpts from political reporter Bob Woodward's latest book, "Fear: Trump in the White House," became public.

In the book, Woodward describes a mock interview Trump did with his legal team, in which they hoped to prove to the President that he shouldn't sit down with Mueller's team for an interview. Trump's lawyer at the time, John Dowd, viewed the interview as a disaster. According to Woodward, Trump seemed surprised by Dowd's reaction and asked, "You think I was struggling?"

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