During Prime Minister’s Questions on Wednesday, Johnson laid into the SNP and their record on education in Scotland, before seemingly taunting Ian Blackford and telling them to stop being “obsessed” with a 2nd independence referendum.

As Blackford was being called to speak, one of his SNP colleagues next to him was heard labeling Johnson a “desperate liar” three times.

Using such language in the chamber would normally be considered “unparliamentary,” meaning the House Speaker would normally call on the MP in question to withdraw their remarks. However, the unidentified lawmaker seemingly got lucky, as Speaker Sir Lindsay Hoyle appeared to not pick up on the incendiary comments.

It’s not the first time an SNP MP has branded the UK prime minister a liar. In June 2019 Blackford himself claimed in the House of Commons that Johnson had “made a career out of lying,” prompting uproar on the Conservative benches.