During a White House press briefing on Thursday that followed yet another week of erratic behavior by President Donald Trump—including a tweet in which the president boasted of the size of his “nuclear button”—Playboy magazine’s White House correspondent Brian Karem asked a question that is, in some form, on the minds of many: when Trump undergoes his physical next week, will his “mental acuity” be tested as well?

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Karem was hardly alone in questioning White House Press Secretary Sarah Huckabee Sanders on the president’s mental capacity. Indeed, as the Washington Post‘s Aaron Blake notes, two consecutive press briefings have been interspersed with questions related to Trump’s cognitive health.

“We feel that the rush of tweeting is an indication of his falling apart under stress.”
—Dr. Bandy X. Lee, Yale University

When asked whether the president has a response to those who are doubting his fitness for the office of the presidency, Sanders insisted that Trump is “an incredibly strong and good leader,” called any suggestion to the contrary “disgraceful,” and argued that “if he was unfit he probably wouldn’t be sitting” in the Oval Office.