DHS的法律依据应该是这一条
g) Criminal activity. A condition of a nonimmigrant’s admission and continued stay in the United States is obedience to all laws of United States jurisdictions which prohibit the commission of crimes of violence and for which a sentence of more than one year imprisonment may be imposed. A nonimmigrant’s conviction in a jurisdiction in the United States for a crime of violence for which a sentence of more than one year imprisonment may be imposed (regardless of whether such sentence is in fact imposed) constitutes a failure to maintain status under section 241(a)(1)(C)(i) of the Act
8 USC 1201(i) After the issuance of a visa or other documentation to any alien, the consular officer or the Secretary of State may at any time, in his discretion, revoke such visa or other documentation.
Any alien who is present in the United States in violation of this chapter or any other law of the United States, or whose nonimmigrant visa (or other documentation authorizing admission into the United States as a nonimmigrant) has been revoked under section 1201(i) of this title, is deportable.