BANGKOK (AP) — Supporters of Thailand’s embattled prime minister have chained shut the headquarters of the National Anti-Corruption Commission a day before it plans to charge her with mishandling a government rice subsidy program.

Prime Minister Yingluck Shinawatra’s supporters, called Red Shirts, are copying the tactics of her opponents, who have blocked various government agencies since January to pressure her to resign.

The Red Shirts on Wednesday chained the entrances of the anti-graft agency, which they believe is persecuting her. The rice subsidy program has accumulated losses of at least $4.4 billion and has been dogged by corruption allegations. Payments to farmers have been delayed by many months.

Yingluck’s opponents want to replace her government with an appointed council that would introduce vaguely described anti-corruption reforms.