WASHINGTON — Secretary of State Mike Pompeo escalated his clash with a respected NPR journalist on Saturday, lashing out at her and what he called the “unhinged” news media in an extraordinary statement. A day earlier, he abruptly ended an interview with her and delivered what the news outlet described as a profanity-laced rant.

The statement, which used the fiery language to attack the news media that has become a trademark of President Trump and his allies, ignited outrage online among foreign policy experts, scholars of diplomacy and press freedom advocates.

Mr. Pompeo violated the goals and nonpartisan nature of his office, whose core mission is to promote American values worldwide, including freedom of the press, they said.

The interview between Mr. Pompeo and the reporter, Mary Louise Kelly, circulated widely after it was published on Friday night. Describing a tense exchange after a taped part of the interview, Ms. Kelly said that Mr. Pompeo shouted at her repeatedly using the “f-word” and challenged her to find Ukraine on an unlabeled map that his aides pulled out, which she did.