President Trump has a message for the nation’s children: Prepare to sacrifice for your country.

He was taking questions at the end of one of his marathon cabinet meetings when he finally allowed that, yes, his tariff policies and the trade war he has set off with China may soon result in some emptier-than-usual shelves in stores. Specifically, toy stores.

“You know, somebody said, ‘Oh, the shelves are going to be open,’” Mr. Trump said. “Well, maybe the children will have two dolls instead of 30 dolls, you know? And maybe the two dolls will cost a couple of bucks more than they would normally.”