The Supreme Court on Monday pressed the Food and Drug Administration on whether it followed the law in its effort to keep flavored e-cigarettes off shelves, weighing a lawsuit from a multibillion-dollar industry that has come under scrutiny because its products are popular with school-aged children.

The FDA has rejected applications for more than 1 million fruit, candy and dessert-flavored e-cigarettes and vaping liquids in recent years.

The U.S. Supreme Court examined on Monday the U.S. Food and Drug Administration's refusal to let two e-cigarette companies sell flavored vape products that regulators consider a health risk to youths,