Robert F. Kennedy Jr. delivered a stark ultimatum to major food company CEOs in a closed-door meeting this week: Ban certain artificial dyes from your products or the government will do it for you.

Mr. Kennedy told executives of major food companies that he wants synthetic colors removed from their products. “Decision time is imminent,” a trade group warned its members.

Kennedy Jr. told food companies including PepsiCo and Kraft Heinz in a meeting on Monday that the Trump administration wants artificial dyes out of the food supply before Kennedy leaves office, according to an email seen by Reuters.