How did the USA PATRIOT Act change the rules for detaining or deporting foreign nationals suspected of terrorism?

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George W. Bush: signing of USA PATRIOT Act — USA PATRIOT Act Pres. George W. Bush signing the USA PATRIOT Act in the East Room of the White House, Washington, D.C., October 26, 2001.

The USA PATRIOT Act introduced new terrorism-related grounds for detaining or deporting foreign nationals or denying them admittance to the United States. Additionally, the act facilitated greater interagency cooperation by allowing government attorneys to disclose information obtained before a federal grand jury to various officials, including those in immigration and national security, provided the information concerned foreign intelligence or counterintelligence.1

Beyond these specific changes to detention and deportation criteria, the act also significantly increased resources for immigration enforcement by tripling the number of personnel for the Immigration and Naturalization Service (INS) along the northern U.S. border.1