Merck Merck

Kenneth Frazier, the CEO of Merck, said he was stepping down from a business council as a matter of personal conscience. He's seen here with President Trump during a White House event in July. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

Cattle in holding pens at the Simplot feedlot located next to a slaughterhouse in Burbank, Washington on Dec. 26, 2013. Merck & Co Inc is testing lower dosages of its controversial cattle growth drug Zilmax drug in an effort to resume its sales to the $44 billion U.S. beef industry. Ross Courtney/Reuters/Landov hide caption

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Ross Courtney/Reuters/Landov