Donald Trump won the U.S. presidency in no small part thanks to his promise to enforce immigration restrictions that the Biden administration largely ignored. Election year polls found more voters preferred Trump over then-president Joe Biden on the issue and even favored his proposals for mass deportations.

The Democratic president and his top advisers rejected recommendations that could have eased the border crisis that helped return Donald Trump to the White House.

National Democrats have deployed resources for County Commissioner Eileen Higgins, while Mr. Trump has endorsed former City Manager Emilio Gonzalez.