The celebrity physician, a candidate in Pennsylvania’s Republican primary for Senate, has a long history of dispensing dubious medical advice on his daytime show and on Fox News.
“They’re like, ‘The world’s out of control, why should I be in control?’” the principal of Liberty High School in Bethlehem, Pa., said of some of his struggling students.
The House committee said investigators wanted to ask Mr. Jordan, a Republican congressman from Ohio, about his conversations with former President Donald J. Trump.