President Trump said last week that he doesn’t know whether it’s his job to uphold the U.S. Constitution. That explains a lot about his actions — including his recent dismissal of church-state separation, a constitutional principle that protects religious freedom and legal equality for all.

At a May 1 White House rose garden event on the National Day of Prayer, which did include prayers offered by a rabbi and imam, Trump announced an executive order creating a Religious Liberty Commission stacked with his supporters. Trump took credit for “bringing religion back to our........

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