Somebody told him he could do it, so he did it , and probably giggled until his wattles were sore. From CNN:

President Donald Trump revoked Kamala Harris’s Secret Service protection on Thursday, according to a copy of a letter reviewed by CNN. Former presidents receive Secret Service protection for life. Harris, as a former vice president, received six months of protection after leaving office, according to federal law. That period ended on July 21. However, her protection had been extended for an additional year via a directive—not made public until now—signed by then-president Joe Biden shortly before leaving office, according to multiple people familiar with the undisclosed arrangement. That is the order Trump canceled in his letter, titled “Memorandum for the Secretary of Homeland S

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