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[In Depth] Raising the drawbridge

President Donald Trump’s executive order banning U.S. entry of citizens from seven nations is on hold, but perhaps not for long. The travel ban, meant to last for 90 days as visa vetting procedures were overhauled, roiled students and researchers from Iran, Iraq, Libya, Somalia, Sudan, Syria, and Yemen. A court last month overturned it, but Trump has vowed to issue a streamlined order. Just how many scientists from each country might be hit? Iran, with its large academic community, seemed likely to top the list, an impression borne out…

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