British Prime Minister Boris Johnson faces a revolt in his party over tighter COVID-19 restrictions as the country faces the growing threat of the omicron variant.

Johnson has appeared vulnerable following a series of scandals culminating in a growing furor over parties his staff organized and held while the country observed a strict lockdown during the 2020 Christmas season.

Senior Conservative party members will add to Johnson’s headache as dozens of members plan to vote against strict “Plan B” restrictions Johnson hopes to introduce to limit the impact of the omicron variant.