In November 1997, the Congress Party again withdrew support for the United Front. New elections in February 1998 brought the BJP the largest number of seats in Parliament (182), but this fell far short of a majority. On 20 March 1998, the President inaugurated a BJP-led coalition government, with Vajpayee again serving as Prime Minister. On 11 and 13 May 1998, this government conducted a series of five underground nuclear weapons tests, known collectively as Pokhran-II — which caused Pakistan to conduct its own tests that same year. India's nuclear tests prompted President of the United States Bill Clinton and Japan to impose economic sanctions on India pursuant to the 1994 Nuclear Proliferation Prevention Act and led to widespread international condemnation.