House of Representatives Intelligence Committee Chair Devin Nunes, Judiciary Committee Chair Bob Goodlatte and Oversight Committee Chair Trey Gowdy demanded the documents from Rosenstein by April 16.
An aide to Gowdy told Politico that Rosenstein asked for a few more days to consider the request, and the three committee chairmen agreed.
READ MORE: 'Fake Memos, Lying Comey': Trump Doesn't Believe McCabe's Revelations
Russia has repeatedly denied any collusion, and Trump has been especially outspoken, often using the term "witch hunt" to describe the Mueller probe as politically motivated. Trump’s disdain for the excesses of the investigation has prompted speculation that the US president wants to fire Mueller and calls by Democrats in Congress for a law that would prevent Trump from doing so.