The Department of State (DOS) has issued a regulation that broadens the authority of consular officers to revoke a visa at any time subsequent to issuance of the visa, including when the individual is already in the U.S. Additionally, the regulation allows consular officers and designated officials within DOS to revoke a visa provisionally while considering a final visa revocation.
This rule is effective April 27, 2011. DOS did not issue the regulation through notice and comment rulemaking on the basis that it involves a foreign affairs function of the United States and, therefore, is exempt from those procedures.
Pursuant to section 221(i) of the Immigration and Nationality Act (INA), DOS may determine that a visa should be revoked when information reveals that the applicant was originally, or has since become, ineligible or may be ineligible to possess a U.S. visa. In testimony before Congress in 2004, DOS stated that it had revoked 1,250 visas since September 11, 2001, based on information suggesting possible terrorist activities or links. Congress and the Government Accountability Office (GAO) have put pressure on DOS and the Department of Homeland Security (DHS) to improve their policies regarding visa revocations.
Visa Lawyer Blog

