Thaksin's influence
During the weeks of demonstrations, protesters have occupied various government offices. The rallies have been mostly peaceful, but clashes between protesters and government supporters on November 30 left five people dead.
Protesters and police, who had confronted each other with tear gas and rocks in parts of Bangkok last week, agreed to a truce Tuesday in a show of respect for Thailand's revered king, who celebrated his 86th birthday Thursday.
Protest leaders have said they want to rid Thailand of the influence of former Prime Minister Thaksin Shinawatra, the older brother of Yingluck.
That's an ambitious goal in a country where parties affiliated with Thaksin, who built his political success on populist policies that appealed to Thailand's rural heartland, have won every election since 2001.
Thaksin was ousted in a military coup in 2006 and has spent most of the time since then in exile overseas. If he returns, he risks a two-year prison sentence on a corruption conviction, which he says was politically motivated.
The current protests in Bangkok were prompted by a botched attempt by Yingluck's government to pass an amnesty bill that would have opened the door for her brother's return.
That move added fuel for critics who accuse Yingluck of being nothing more than Thaksin's puppet, an allegation she has repeatedly denied.