Harvard has long been the world's top college. Trump's sanction puts its allure at risk

For students around the world, an acceptance letter to Harvard University has represented the pinnacle of achievement, offering a spot among the elite at a campus that produces Nobel Prize winners, captains of industry and global leaders.

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That allure is now in jeopardy. In its intensifying fight with the White House, Harvard was dealt its heaviest blow yet on Thursday, when the government blocked the Ivy League school from enrolling foreign students. The move threatens to undermine Harvard's stature, revenue and appeal among top scholars globally.

Even more than the government's $2.6 billion in research cuts, the administration's action represents an existential threat for Harvard. The school summed it up in a lawsuit seeking to block the action: “Without its international students, Harvard is not Harvard.”