Enforcement is under the Executive Branch, so he can use his discretion to ignore enforcement. The remedy is impeachment, but that is unlikely. The only thing the GOP can do is try to force his hand. Biden wants money for Ukraine? OK, allocate $100 billion for Ukraine and X billions for construction of 2000 miles of 15 foot high border wall. For every mile of new wall built, $50 million is released to Ukraine.
and X billions for construction of 2000 miles of 15 foot high border wall.
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Not enough. Also required is (1) the immediate expulsion of every single person who has come into this country by any means other than applying for citizenship as the law requires; and (2) the arrest, conviction, and three years imprisonment with no early release of every single person who has been or will be arrested for ANY felony.