The British Conservative Party chairman rejected calls for U.K. Prime Minister Boris Johnson to resign but said he must address the culture within his government that resulted in multiple staff gatherings at his residence during coronavirus lockdowns.

Johnson has apologized for attending a gathering in the garden of his Downing Street residence in May 2020 where staff had been invited to bring their own alcohol at a time when strict rules forbade the public from almost all socializing.

Amid a public backlash at the perception that the government did not follow its own rules during the pandemic, an internal investigation is looking at that party and several others — including parties on the eve of Prince Philip's funeral.