Moreover, Trump’s travel ban has stunned national security experts across the government, none of whom appears to have ever suggested a blanket ban as a way to protect Americans. And, ultimately, Trump’s view of Islam and Muslims makes his travel ban unconstitutional, as several courts have concluded, because it runs headlong into the First Amendment’s protection against the government favoring or, as here, disfavoring any particular religion.

It would be bad enough if Trump’s travel ban were simply unnecessary and unlawful. But it’s also downright dangerous, especially to our country’s counterterrorism efforts. The ban is so obviously, palpably, indeed explicitly anti-Muslim in nature that it has — understandably — offended Muslim-American communities around the world, including in the United States. Yet those are precisely the communities that can prove critical for identifying and responding to individuals becoming radicalized by groups like ISIS and al Qaeda. Moreover, effective counterterrorism relies heavily on robust intelligence-sharing relationships with foreign governments.