On Capitol Hill, the House has defied a veto threat from President Bush to pass a measure that would expand health insurance to millions of low-income children. The State Child Health Insurance Program, known as S-CHIP, expires later this month. Lawmakers have proposed to spend $35 billion to cover an additional four million children. The money would come mostly through a tax increase on cigarettes. The House measure passed 265 to 159, short of the votes needed to override a presidential veto. The Senate is expected to take up the S-CHIP measure later this week.