Health and Human Services Secretary Robert F. Kennedy Jr. told food industry leaders in a closed-door meeting on Monday that he wants them to remove artificial color additives from their products by the end of his time in office, according to a memo describing the meeting, which was obtained by ABC News.

At the Washington gathering, which included the CEOs of Kellogg’s, Smucker’s and General Mills, Kennedy said it is a top priority of the Trump administration to rid America’s food of the artificial dyes, wrote Melissa Hockstad, president and CEO of the Consumer Brands Association, a trade group, who penned the memo.

Hockstad addressed the memo to “Consumer Brands Member CEOs.”

“The Secretary made clear his intention to take action unless the industry is willing to be proactive with solutions,” Hockstad wrote.

Kennedy has long championed removing artificial coloring from America’s food, and the effort has become a pillar of the “Make America Healthy Again” movement.

In January, the Food and Drug Administration revoked its authorization of one type of red food dye — Red No. 3. The dye is known to cause cancer in laboratory animals but was allowed to be used by manufacturers for years because scientists didn’t believe it raised cancer risk in humans at the level typically consumed.

The FDA, under then-President Joe Biden, acted after longtime pressure by consumer advocates.

But a different type, Red No. 40, remains on the market and hasn’t been studied by the FDA in more than 20 years. FDA and health officials said there is no evidence though that it is harmful, and food manufacturers said they need to be able to rely on ingredients generally recognized as safe.

In the memo, Hockstad said her association will work with HHS leaders about removing “roadblocks” so food companies can help meet Kennedy’s goal.

“We will be working with your teams to gain as much alignment as possible about how we move forward and ensure the industry is positioned in the best possible way as we navigate next steps forward,” she wrote. “But to underscore, decision time is imminent.”

A spokeswoman for the Consumer Brands Association confirmed the authenticity of the letter, which was first reported by Bloomberg, but did not provide further comment.

The spokeswoman provided ABC News with a copy of a thank-you letter Hockstad sent Kennedy after the meeting.

“The industry is committed to delivering safe, affordable and convenient product choices to consumers,” she wrote. “We will engage with you and the administration on solutions to improve transparency, ensure ingredient evaluations are grounded in a science and risk-based process and increase healthier options for consumers.”

Vani Hari, an activist and founder of Food Babe and Truvani who delivered 400,000 petition signatures to the Michigan headquarters for Kellogg’s last year asking the company to remove artificial food dyes, applauded Kennedy.

“I have been working on this issue for over a decade and I am thrilled Secretary Kennedy laid out an ultimatum,” Hari told ABC News in a statement.

“These food companies have already reformulated their products without dyes in so many countries, now it’s time for them to do the same in America. Americans deserve the same safer foods other countries get,” she continued.