Transcript for Trump: Notre Dame Cathedral 'one of the greatest treasures of the world'
And among them, president trump was shaken by the sight of notre dame burned. At an event in Minnesota, calling it one of the great treasures of the world. The president offering advice in a tweet, saying firefighters should use flying water tankers. Here's ABC's chief white house correspondent non Jann Carl. Reporter: As the world watched notre dame burn, a somber president trump took note of the tragedy. The fire that they're having at the notre dame cathedral is something like few people have witnessed. It's one of the great treasures of the world and it's burning very badly. Looks like it's burning to the ground. Reporter: Earlier, in a tweet, the president offered some unsolicited advise -- "Perhaps flying water tankers could be used to put it out. Must act quickly!" Would that work? A veteran American firefighter told David it would not. Water is very heavy and if it hits a structure like that out of a tanker, it could cause further collapse. Reporter: Later, the French civil defense agency said, essentially, the same thing, in its one and only tweet of the day in English. "All means are being used, except for water-bombing aircrafts which, if used, could lead to the collapse of the entire structure of the cathedral." And Jon Karl joins us live from the white house. And Jon, in addition to watch what was unfolding in Paris, the president also aware of the other major headline here at home, that there is news on the Mueller report. You're learning that attorney general bill Barr will release the redacted report on Wednesday. Has the white house been briefed on this? Reporter: They have been, but only in the broadest of brush strokes, the logistics and the timing of the report. The white house has not asked Robert Mueller to see a copy of the report and more importantly, David, the white house has not asked to have anything redacted by invoking executive privilege. David? Jon Karl, thank you. We're going to turn to the deadly weather in this country
This transcript has been automatically generated and may not be 100% accurate.