A subpoena has been issued demanding Robert Mueller's full report into Russia's alleged meddling during the 2016 US Presidential election.
It comes as claims grow that the current redacted version "leaves most of Congress in the dark."
However the Department of Justice has labelled the subpoena "premature and unnecessary".
The Department said it would "continue to work with Congress to accommodate its legitimate requests consistent with the law and long-recognized executive branch interests".
US President Donald Trump and his legal team claim the findings of the report fuller exonerate the president.

Trump not satisfied with Iran's latest proposal for talks
Iran sends proposal for negotiations with US to mediator Pakistan
Iran threatens painful response if US renews attacks
Ukrainian drones hit Russian port of Tuapse for the fourth time
Detained Myanmar ex-leader Suu Kyi to meet legal team this weekend
