Three possibilities.
1. He was repeating something that some jackass on his favorite show (FOX & Friends) had speculated about just a few minutes before he Tweeted it.
2. He was repeating classified info he had been briefed on.
3. He just made it up.
None of those are good options.
And then there's this.............
Why would his first reaction to a dangerous, unfolding situation be to seemingly chastise the people on the front lines for not having been on top of it, or aggressive enough?
It’s the same question that came up when Trump responded to a North Korean nuclear test by deriding the South Koreans as appeasers.
Both the United Kingdom and South Korea are our allies; both had a right to expect that the American President’s first expression would be one of sympathy or support—of respect, one way or the other.
https://www.newyorker.com/news/amy-davi ... -migration
Why indeed.