Donald Trump has admitted he shared information about “terrorism and airline flight safety” with Russia.
The US President met with the Russian foreign minister, Sergei Lavrov, and ambassador to the US, Sergey Kislyak, at the White House last week.
On Monday reports emerged that he had shared highly classified information with the two men during the meeting.
Responding to the controversy on Twitter Mr Trump tweeted: “I wanted to share with Russia… which I have the absolute right to do, facts pertaining to terrorism and airline flight safety.”
Mr Trump said he shared the information for “Humanitarian reasons, plus I want Russia to greatly step up their fight against ISIS & terrorism”.
He did not address whether the information he shared was classified.
According to The Washington Post and others, during the meeting Mr Trump boasted of the great intelligence he had received about an Islamic State plot to use laptops to blow up planes.
That information had apparently been received from another country and was not America’s to share.
On Monday the White House denied that any classified information was revealed and said the men had discussed “a range of common threats to our countries including threats to civil aviation”.
National security advisor General HR McMaster said he was in the room for the discussions and that “at no time were intelligence sources or methods discussed”.
“The President did not disclose any military operations that were not already publicly known”, he said.
Russia’s foreign ministry has also denied the reports.
The meeting happened the day after Mr Trump sacked FBI director James Comey, who was in charge of investigating whether the President’s campaign colluded with Russia to swing the election.