LONDON (AP) — Britain's main opposition leader is facing calls to apologize after he was accused of calling Prime Minister Theresa May a "stupid woman" in the House of Commons.

Labour Party leader Jeremy Corbyn was caught on camera appearing to mutter the insult Wednesday during the prime minister's weekly question-and-answer session.

Corbyn's spokesman insisted the Labour leader had said "stupid people" in reference to lawmakers on the governing Conservative side. But the episode caused an uproar, with Conservative legislators yelling "Shame!" and "Disgraceful!"

Commons Speaker John Bercow said he had not seen the exchange in question, but would look at the evidence and report back to the House later in the day.

The incident has echoes of Donald Trump branding rival Hillary Clinton a "nasty woman" during the 2016 U.S. presidential campaign.