By late Monday, in the immediate aftermath of the violence in Charlottesville, Va., the number of corporate chiefs serving as advisers to President Trump had shrunk by three. The question is, will more follow?

Here are the C.E.O.s who departed on Monday:

• Kenneth C. Frazier of Merck, who was the first to step down from the White House’s manufacturing advisory council following Mr. Trump’s initially tepid response to the events in Charlottesville;

• Kevin Plank of Under Armour, who followed later in the day;

• Brian Krzanich of Intel, who made his own announcement hours afterward.

After earlier contentious moves by the president, other executives have also stepped down as advisers:

• Elon Musk of Tesla, who left Mr. Trump’s Strategic and Policy Forum in June because of the president’s withdrawal from the Paris climate change accord;