After Indira, Rajiv—her eldest son and 40 years old at the time—was sworn in on the evening of 31 October 1984, becoming the youngest person ever to hold the office of prime minister. Rajiv immediately called for a general election. In the subsequent general election, the Congress secured an absolute majority, winning 401 of 552 seats in the Lok Sabha, the maximum number received by any party in the history of India. Vishwanath Pratap Singh—first finance minister and then later defence minister in Gandhi's cabinet—uncovered irregularities, in what became known as the Bofors scandal, during his stint at the Ministry of Defence; Singh was subsequently expelled from Congress and formed the Janata Dal and—with the help of several anti-Congress parties—also formed the National Front, a coalition of many political parties.