Transcript for WH denies Trump shared classified information with Russian officials
And we do move on now to the breaking headline tonight. The white house is denying some potentially damaging allegations. And here's ABC's David Wright with this story. Reporter: What did Donald Trump tell the Russians in that chummy closed-door meeting last week in the oval office? Tonight, this exclusive "Washington post" story is causing a major stir, alleging that in that meeting trump revealed classified information about an ISIS plot to use laptop computers in terror attacks aboard airplanes. "In his meeting with lavrov, the Russian foreign minister, trump seemed to be boasting about his inside knowledge of the looming threat," writes the post. The post says the information the president shared was code word clearance, highly classified, and shared privately with the U.S. By a foreign government, a key partner in the fight against ISIS. If it's true, obviously it's disturbing. But I think we've got to find out more before I could comment. Reporter: The meeting with the Russians was already controversial. The morning after trump fired the FBI director who was overseeing the investigation into possible collusion between trump associates and the Russians during the 2016 campaign. According to the "Post" the president not only shared with the Russians what he knew about the alleged plot but also what city in Syria the alleged ally uncovered it in. The identification of the location was seen as particularly problematic, officials told the "Post," because Russia could use that detail to help identify the U.S. Ally or intelligence capability involved. The story that came out tonight as reported is false. Reporter: Tonight trump's national security adviser issued a carefully worded denial. At no time, at no time were intelligence sources or methods discussed. And the president did not disclose any military operations that were not already publicly known. Reporter: He wasn't the only top white house official to take issue with the "Post's" reporting. Deputy national security adviser Deena Powell said, "This story is false. The president only discussed the common threats that both countries faced." I'm David Wright for "Nightline" in New York.
This transcript has been automatically generated and may not be 100% accurate.