Fouad Ajami’s column in the latest U.S. News & World Report includes the following passage about John Locke (the philosopher, not the foundation):

Little more than three centuries ago, John Locke ridiculed the notion
that a Muslim could make a home in a Christian land. “It is ridiculous
for any person to profess himself to be a Muhammadan only in his
religion, but in everything else a faithful subject to a Christian
magistrate, whilst at the same time he acknowledges himself bound to
yield blind obedience to the mufti of Constantinople.” The
civilizational lines were sharply drawn in Locke’s time. Modernity and
globalism pretend otherwise.

Ajami uses that passage to highlight his concern that would-be terrorists need not offer any clues about their twisted plans. He cites evidence that terrorists involved in incidents in Britain and Canada were “homegrown Islamists.”