For over three years, critics of President Joe Biden have watched dumbfounded as he has resolutely refused to close the southern border. Unfettered illegal immigration has led to deaths from fentanyl poisoning, outbreaks of once-rare diseases like measles and tuberculosis, surging crime in sanctuary cities, heightened national security concerns — and abysmal approval ratings for the president.

Though he has denied it, Biden has had the ability at any time to reimpose the guardrails erected by former President Donald Trump, who instituted the “remain in Mexico” provision, demanded Mexico help slow the north-bound caravans, ended the Obama-era “catch-and-release” practice, built sections of border fencing and introduced other measures that reduced illegal crossings. In his first weeks in office, Biden undid more than a dozen Trump-era rules, and has now allowed now more than 5 million people to flood into the country.

Abdication of responsibility on the border has become a top political headache for Biden, and yet — other than blaming Republicans for not passing an immigration law that he dishonestly claims would have solved the problem — the president has been unmovable.

There are three possible reasons for his stubborn embrace of a policy that even his Democratic colleagues opposed not so long ago.

First, Biden still depends on the far-left flank of his party, without which he would not have become president, and progressives Democrats favor an open border. Don’t forget the pact made in 2020 by the........

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