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Those policies have coincided with a sharp decline in illegal border crossings.
The administration has cited those figures as evidence that aggressive enforcement and detention policies have fundamentally changed conditions at the southern border.
Trump now wants Congress to make at least some of those changes more difficult for a future White House to undo.
Presidents possess significant authority to determine how existing immigration statutes are enforced, including decisions involving enforcement priorities, detention resources, parole authority and restrictions on the admission of certain foreign nationals.
But Congress has the primary constitutional authority to write the nation’s immigration laws. The Supreme Court has repeatedly recognized Congress as possessing exceptionally broad power over who may enter or remain in the United States.
An executive order can generally be revoked or replaced by a later president. A federal statute cannot be eliminated through a new executive order alone.
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