The White House on Monday denied restricting an FBI inquiry into sexual misconduct allegations made against Supreme Court nominee Brett Kavanaugh.
Democrats have been alarmed at reports in US media that the White House was limiting who could be interviewed under the investigation.
President Donald Trump ordered the inquiry on Friday at the request of a Senate committee.
Kavanaugh denies the allegations against him.
The new inquiry has delayed a final vote on Judge Kavanaugh, who if confirmed is likely to tip America’s highest court in favour of conservatives.
Several US media outlets over the weekend said that the scope of the investigation was being constrained by the White House, reporting that one of Kavanaugh’s accusers, Julie Swetnick, would not be interviewed.
Trump has denied imposing any restrictions, saying he wanted the FBI “to interview whoever they deem appropriate” in its check on his pick for the Supreme Court.