London—The theoretical physicist Stephen Hawking angered supporters of Donald J. Trump on Monday by responding to a question about the billionaire with a baffling array of long words.

Speaking to a television interviewer in London, Hawking called Trump “a demagogue who seems to appeal to the lowest common denominator,” a statement that many Trump supporters believed was intentionally designed to confuse them.

Moments after Hawking made the remark, Google reported a sharp increase in searches for the terms “demagogue,” “denominator,” and “Stephen Hawking.”

“For a so-called genius, this was an epic fail,” Trump’s campaign manager, Corey Lewandowski, said. “If Professor Hawking wants to do some damage, maybe he should try talking in English next time.”

Later in the day, Hawking attempted to clarify his remark about the presumptive Republican Presidential nominee, telling a reporter, “Trump bad man. Real bad man.”