New Delhi, Feb. 12 -- When Tarique Rahman, the son of a former prime minister of Bangladesh, returned to the country in December after 17 years of self-imposed exile, he declared to his supporters: "I have a plan."

Rahman returned at a time of upheaval. Bangladesh was seemingly adrift under an interim administration as it inched closer to a nationwide poll. Many Bangladeshis felt his return offered the country a new chance. His fiercest rival, the former Prime Minister Sheikh Hasina, would be absent from the election after being toppled by a violent student-led revolt in 2024.

Barely two months later, Rahman is widely seen as the front-runner in Thursday's election. He restated his ambitions at a campaign rally in Dhaka on Monday, arriv...