1. Short title This Act may be cited as the Preventing Aliens Through Rivers Or Land Act or the PATROL Act . 2. Prohibition on civil action for certain border security measures (a) In general The Attorney General may not bring or maintain a civil action (including an action that is pending on the date of enactment of this Act) under section 9 or 10 of the Act of March 3, 1899 ( 33 U.S.C. 401 ; 403), against a State for any measure undertaken by the State to build, construct, erect, or otherwise install a barrier along the international border of the State for the purpose of— (1) preventing aliens from entering the State in violation of the immigration laws; or (2) protecting the territory of the State. (b) Definitions In this section: (1) Alien The term alien has the meaning given such term in section 101 of the Immigration and Nationality Act ( 8 U.S.C. 1101 ). (2) Barrier The term barrier means any physical structure intended to secure the border, including a wall, fence, or floating buoy. (3) Immigration laws The term immigration laws has the meaning given such term in section 101 of the Immigration and Nationality Act ( 8 U.S.C. 1101 ).