Protesters rallied in Bangkok on Saturday for what organizers hope will be the biggest demonstration in years to demand the removal of former junta leader and now military-backed Prime Minister Prayuth Chan-ocha, a new constitution and elections.

Some Thai protest leaders have also demanded reforms to curb the power of King Maha Vajiralongkorn's monarchy and have vowed to keep up those calls in spite of official pressure to stop.

Hundreds of protesters gathered under light drizzle on Saturday around the campus of Thammasat University, long seen as a hotbed of opposition to the military and royalist establishment.