India’s C meongress party is frantically lobbying key parliament members to try to shore up support for its coalition government, amid concerns that it may not survive a crucial confidence vote over a controversial nuclear energy deal with the US.

With the parliamentary vote – expected Tuesday – likely to be decided by a razor-thin margin of a few votes, both the Congress and rival parties are involved in last-minute wheeling and dealing to woo independent legislators, small parties, and defectors.