Old rifts resurfaced in Britain’s ruling Conservative Party on Saturday following former Prime Minister Boris Johnson’s abrupt resignation from parliament, while the opposition Labour Party sensed opportunity ahead of a general election next year.

Johnson quit late on Friday in protest against an investigation by lawmakers into his conduct as prime minister during the height of the COVID-19 pandemic, when lockdown-breaking parties were held in Downing Street.

In his resignation statement, Johnson railed against the inquiry that examined whether he misled the House of Commons about the gatherings, saying it had not found “a shred of evidence” against him. He also took aim at current Prime Minister Rishi Sunak.