Shares of Tyson Foods and Smithfield Foods fell in late-morning trading in New York after The Wall Street Journal reported that the Justice Department's antitrust division has opened a criminal probe into major meatpackers.

The report follows President Trump's push for an investigation into meatpackers as supermarket beef prices remain near record highs.

Criminal antitrust cases are typically brought for alleged price-fixing, collusion, or bid-rigging. While the DoJ previously disclosed an investigation into beef companies after Trump called for action, it had not provided details on whether it was criminal.

In early November, Trump publicly stated, "I have asked the DOJ to immediately begin an investigation into the Meat Packing Companies who are driving up the price of Beef through illicit collusion, price fixing, and price manipulation."

"We will always protect our American ranchers, and they are being blamed for what is being done by majority foreign-owned meat packers, who artificially inflate prices and jeopardize the security of our nation's food supply," Trump continued.

Beef prices at supermarkets have soared to record highs after years of drought, and elevated input prices led to the smallest U.S. herd in a generation. Trump's tariffs on Brazil, a major beef exporter, have also curbed imports.

Also, last year, Trump suggested the U.S. would buy Argentine beef to increase domestic supplies and curb higher prices for Americans. This, in turn, angered U.S. cattle ranchers.

Shares of top publicly traded meatpackers, including Tyson Foods and Smithfield Foods, fell after the WSJ report hit.

Tyson Foods

Smithfield Foods

Rep. Thomas Massie (R-Ky.) has pointed out that "Four meat packers control 85 percent of the meat processed in the U.S."

Meanwhile, Senate Democratic Leader Chuck Schumer (D-N.Y.) and 12 other senators have proposed legislation that would force the nation's largest meatpackers to break up their operations across beef, pork, and poultry.

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The DOJ's criminal investigation into beef companies comes as the Trump administration attempts to push forward with affordability policies as the K-shaped economy continues hammering the working poor.