"America's leaders must honour our fundamental values by clearly rejecting expressions of hatred, bigotry and group supremacy, which run counter to the American ideal that all men are created equal," Merck CEO Kenneth Frazier, who is African American, wrote on Twitter yesterday.
"As CEO of Merck and as a matter of personal conscience, I feel a responsibility to take a stand against intolerance and extremism."
Trump didn't wait long to respond.
Later in the day, Trump went back at Frazier, saying that Merck was "a leader in higher & higher drug prices while at the same time taking jobs out of the U.S. Bring jobs back & LOWER PRICES."
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"Under Armour engages in innovation and sports, not politics," he said in a statement.
"I love our country and our company and will continue to focus my efforts on inspiring every person that they can do anything through the power of sport, which promotes unity, diversity and inclusion."
The CEOs announced their decision as criticism was mounting over Trump's failure over the weekend to explicitly denounce the neo-Nazis and Ku Klux Klan members whose rally in Charlottesville, Virginia set off violent clashes.
A man drove his car into a crowd of anti-racism protesters, killing a young woman and injuring 19. Two state police officers responding to the events died in a helicopter crash near the area.
Later yesterday, Trump made a statement calling out specific hate groups.
"Racism is evil. And those who cause violence in its name are criminals and thugs, including the KKK, neo-Nazis, white supremacists and other hate groups that are repugnant to everything we hold dear as Americans," he said from the White House.
Frazier is a Harvard Law School-trained attorney whose experience includes pro bono work that won the release of a wrongly convicted death row inmate in Alabama.
Frazier is not the first executive to depart a Trump advisory panel.
After Trump announced he would withdraw the United States from the Paris climate agreement, Disney chief executive Bob Iger and Tesla Motors head Elon Musk both left a White House advisory council, joining former Uber leader Travis Kalanick, who stepped down in February following criticism of Trump's travel ban.
"Heartbroken by the violence in #Charlottesville. Hate and intolerance are a betrayal of what we stand for as Americans," said Pepsi chief executive Indra Nooyi, in a statement that did not address the Trump panel.
Other executives, including those from General Electric and Dow, planned to stay on Trump panels, US financial news media reported.
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