White House Press Secretary Kayleigh McEnany on Wednesday said Goodyear Tire & Rubber Co “needs to come out and clarify” a company policy that has deemed political attire, including that of the Trump campaign, unacceptable for the workplace.

U.S. President Donald Trump tweeted earlier in the day, calling for a boycott of the U.S. company because of the policy.

"Don't buy GOODYEAR TIRES - They announced a BAN ON MAGA HATS," the president wrote, referring to his slogan "Make America Great Again" that is often featured on baseball caps worn by his supporters.

Shares in Goodyear, the largest tire company in North America, fell 4.2% following Trump's Twitter post.

"To be clear on our longstanding corporate policy, Goodyear has zero tolerance for any form of harassment or discrimination," a statement posted on the company's official Twitter account said.

To enforce that policy, Goodyear said, it asks employees to refrain from "workplace expressions in support of political campaigning for any candidate or political party as well as similar forms of advocacy that fall outside the scope of racial justice and equality issues."

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