In contrast, last year we issued over 159,000 visas to Chinese citizens traveling to the United States for business, tourism and to study.

There were complaints as India tightened rules for long-term tourist visas, after the arrest of a Pakistani American who was accused of involvement in planning the November 2008 attack on Mumbai.

There is said to be "a huge and growing industry in Asia that arranges tourist visas for pregnant women so they can fly to the United States and give birth to an American."