Carl Icahn speaking at Delivering Alpha in New York on Sept. 13, 2016.Carl Icahn speaking at Delivering Alpha in New York on Sept. 13, 2016.

Carl Icahn is pushing for two board seats at McDonald's in a proxy fight over the fast food giant's treatment of pigs.

McDonald's said Sunday in a release that Icahn has nominated two people for election at the company's annual shareholder meeting in 2022.

The Humane Society U.S. has already introduced a shareholder proposal that relates to the company's pork commitment.

Icahn, who helped define a new era of capitalism in the 1980s after taking over Trans World Airlines, has pushed McDonald's for better treatment of pigs, according to The Wall Street Journal. He wants the end of an industry practice that uses crates to house pregnant pigs so they can't move.

Icahn told The Journal that he felt emotional about animals.

According to the release, the corporate raider wants McDonald's to require all of its U.S. suppliers to move to arate-free pork. The fast food chain uses pork in some of its products.

The current pork supply in the U.S. would make this type of commitment impossible.

According to the release, Icahn has 200 shares of McDonald's stock. McDonald's questioned why Icahn hadn't called on that company to make similar commitments, as he is the majority owner of a company that supplies packaging for the pork and poultry industry.

McDonald's shares were down slightly on Friday.