The report comes after a flap over release of photos from the meeting, which occurred just after it was revealed Trump fired FBI Director James Comey, amid tumult over the FBI's Russia investigation.
As the latest sensational story to come out of Russia broke, White House press secretary Sean Spicer huddled with his communications team in the White House.
A series of press aides declined to comment to a group of reporters, including DailyMail.com, looking for confirmation or a denial that the president had passed on the information to the nation's longtime adversary.
McMaster commented only as he ran into a pack of reporters in the White House.
'This is the last place I wanted to be. I'm leaving,' he said as a joke.
Rep. Adam Schiff (D-Calif.), vice chair of the House Intelligence Committee, called the report 'deeply disturbing.'