The leaders of protests in Thailand plan to revive demonstrations as soon as the country’s worst COVID-19 outbreak starts to ease, adding to the government’s challenges as it comes under fire for a slow vaccine rollout.

After a monthslong hiatus due to a spike in cases, protest leaders say they’re working to draw fresh support from frustrated residents for a movement that began last year with calls for Prime Minister Prayuth Chan-Ocha’s resignation and unprecedented reforms of the monarchy.

Authorities have faced increasing public criticism for Thailand’s third wave of COVID-19, which has more than quadrupled total cases since early April.