There are reports the US President's being investigated on suspicion of obstruction of justice connected to the Russia investigation.
The Washington Post says the accusation - which is an impeachable offence - was triggered by Donald Trump's sacking of FBI director James Comey.
Investigators have also been looking for evidence of financial crimes among his associates.
A spokesperson for Mr Trump's lawyer has blamed the leak on the Bureau - calling it "outrageous, inexcusable and illegal".