http://www.newsweek.com/trump-says-thats-too-bad-after-crash-uss-john-mccain-652584The USS John S. McCain (named after Sen. McCain's father and grandfather) collided with a merchant ship near Singapore. A number of personnel were airlifted to Singapore for treatment for non-life-threatening injuries.
However, 10 sailors are still missing.
Trump's response when asked? "That's too bad."
Now, he was asked this about half an hour before the news was officially announced by the military, so it's entirely believable that this is literally the first time he's heard about it.
But here's what he could have said (and what any other President would have said):
"I haven't been fully briefed on the situation, and I will have more to say once I have been. But for now my thoughts and prayers are with the sailors and their families, and we will perform a thorough investigation into the accident and put every effort into our search-and-rescue operations. Thank you."
Diplomatic, presidential, and nowhere contains the phrase "That's too bad."