The FBI has publicly challenged a push by Republican lawmakers to release a controversial memo which purports to show anti-Trump bias at the agency.
"We have grave concerns about the material omissions of fact that fundamentally impact the memo's accuracy," the FBI said in a statement.
A top Trump aide said on Wednesday they would release the top secret document "pretty quick", despite the objections.
Democrats claim the memo is an attempt to discredit the FBI-led Russia probe.
"It will be released here pretty quick, I think, and the whole world can see it," White House chief of staff John Kelly said during an interview with Fox News Radio on Wednesday morning.
Hours later, the FBI issued a rare statement saying that it had had "limited opportunity" to review the document before the House Intelligence committee voted to release it on Monday.
"We are committed to working with the appropriate oversight entities to ensure the continuing integrity of the FISA (Foreign Intelligence Surveillance Act) process," the FBI statement added.