Barack Obama was facing a mounting domestic and international backlash against US surveillance operations on Monday as the administration struggled to contain one of the most explosive national security leaks in US history. Political opinion in the US was split with some members of Congress calling for the immediate extradition from Hong Kong of the whistleblower, Edward Snowden. But other senior politicians in both main parties questioned whether US surveillance practices had gone too far. Dianne Feinstein, chairman of the national intelligence committee, has ordered the NSA to review how it limits the exposure of Americans to government surveillance. But...