Thousands of protesters descended on the Serbian city of Kraljevo on Sunday, keeping up pressure on President Aleksandar Vucic a day after he said he would step down within weeks to pave the way for early presidential and parliamentary elections. Although many protesters expressed satisfaction with Vucic’s resignation, they fear he may not fully relinquish power. Analysts say he may try to run for prime minister and install an ally in the presidency so he can continue to wield power.