August 14: Merck's Frazier quit the manufacturing group after Trump responded to the violence in Charlottesville, Virginia, with a statement that condemned hatred, bigotry and violence "on many sides".
Merck have stated that they have no further comment on Frazier's statement, according to a report by FiercePharma.
Second to resign from the council, Plank wrote in a statement that though he is appreciative of the opportunity, his company "engages in innovation and sports, not politics". Three of the nation's top executives resigned from a federal panel created years ago to advise the USA president.
The criticism of the president arose after his statement, which was considered to be not strong enough, regarding the deadly incident in Virginia where a auto drove into a crowd of people who were protesting a white supremacist rally.
William Galston, a senior fellow at the Brookings Institution, said he couldn't "think of a parallel example" of any President responding as viciously to a chief executive departing an advisory council as Mr Trump's attack on Mr Frazier.
The dispute over the panels began on Monday, when Merck's Kenneth Frazier took a public stand against Trump, saying that quitting the manufacturing council was "matter of personal conscience" and said that USA leaders had to reject "hatred, bigotry and group supremacy". The CEOs who left the council quickly faced his wrath, while those who have stayed have said it's important to speak with the president on economic issues. The president added that he believes economic growth in the USA will heal its racial divide.
Plank, who did not say exactly why he was stepping down, joined Merck CEO Kenneth Frazier, who also announced he was leaving the president's business council on Monday.
August 16: General Electric Co.'s Jeffrey Immelt, on the manufacturing council, issued this statement after Trump's tweet."The President's statements yesterday were deeply troubling".
A White House official downplayed the importance of the manufacturing council and a separate policy and strategy forum featuring corporate leaders.
"Bigotry, hatred and extremism are an affront to core American values and have no place in this country", said Stephen A. Schwarzman, the chief executive of the private equity firm the Blackstone Group and one of the president's closest advisers in the business community.
June 1: Walt Disney Co.'s Bob Iger also left the strategy forum over climate change.
The manufacturing jobs council had 28 members initially, but it has shrunk since it was formed earlier this year as executives retire, are replaced, or, as with Frazier, Musk, Plank and Krzanich, resign.
August 16: Campbell Soup Co.'s Denise Morrison quit the manufacturing group."Racism and murder are unequivocally reprehensible and are not morally equivalent to anything else that happened in Charlottesville", she said.