The same Supreme Court that ruled that President Donald Trump is allowed to use the powers of the presidency to commit crimes finally placed a meaningful limit on Trump’s authority on Tuesday.

In Trump v. Illinois, three Republican justices joined all three of the Court’s Democrats in ruling that Trump violated federal law when he deployed a few hundred members of the National Guard to squelch protests outside of an immigration detention facility in Broadview, Illinois, which is about 12 miles west of Chicago.

Notably, however, Justice Brett Kavanaugh wrote a separate opinion saying he would have ruled against Trump on very narrow grounds. So, it appears that only a bare majority of the justices voted to place significant limits on Trump’s authority to deploy the military against Americans located on US soil.

Trump attempted to use the military against a small number of protesters outside of the Broadview facility. According to Judge April Perry, a federal district judge who previously heard this case, “the typical number of protestors is fewer than........

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