Paetongtarn has faced growing dissatisfaction over her handling of the latest border dispute with Cambodia, involving an armed confrontation on May 28 in which one Cambodian soldier was killed.

Paetongtarn Shinawatra, Thailand’s youngest prime minister and scion to the country’s most prominent political dynasty, may lose power barely a year after taking the top political office.

Chaikasem, who turns 77 in August, has extensive government experience: a former attorney general, he served as Minister of Justice under former Prime Minister Yingluck Shinwatra—Thaksin’s sister and Paetongtarn’s aunt—until that government was overthrown in 2014.