Replaces section 236 (8 U.S.C. 1226) with a new text governing apprehension, bond determination, custody determinations, initial and subsequent hearings, presumptions, least-restrictive conditions, protections for vulnerable persons and primary caregivers, and limits on duration and standards for continued detention.

Replaces the text of section 287(a) to redefine warrantless interrogation and arrest powers of DHS officers and to add a prompt post-arrest probable-cause hearing requirement.

Amends section 235(b) to change references from 'detained' to 'referred' in specified paragraphs, altering custody handling of certain arriving aliens.

Strikes section 236A (8 U.S.C. 1226a) from the Immigration and Nationality Act, removing the statutory provision on mandatory detention of suspected terrorists.

Makes technical and substantive amendments to section 238 (8 U.S.C. 1228) regarding special removal proceedings for certain criminal aliens, including cross-reference updates and redesignation of subsections.

Amends section 241(a) (8 U.S.C. 1231(a)) to shorten the removal period and add prompt custody redetermination hearings and detention-limitation rules for aliens ordered removed.