内容摘要："It is exceptional. We are about two and half months in, which is very long," says Dr Berthou.

"It is exceptional. We are about two and half months in, which is very long," says Dr Berthou.

In April, the US Department of Homeland Security (DHS) stated that it would consider "antisemitic activity on social media and the physical harassment of Jewish individuals as grounds for denying immigration benefit requests".As part of the broader crackdown, Trump's team has frozen hundreds of millions of dollars in funding for universities and moved to deport students, while revoking thousands of visas for others. Many of these actions have been blocked by the courts.

The White House has accused some US universities of allowing pro-Palestinian activism on campus to be hijacked by antisemitism.Universities have accused the Trump administration of trying to infringe on free speech. Critics say the new policy on social media vetting represents a further violation of the rights that are supposed to be enshrined by the First Amendment in the US Constitution.Trump has throughout his presidency countered that he is working to defend free speech.

Harvard University has been the focal point of the president's ire; he has frozen $2.65bn (£1.96bn) in federal grants to the institution and has sought to put other federal funding worth $100m under review.The university's president has said the cuts will "hurt" the country, not just Harvard, because academics were conducting research deemed "high-priority" by the government.

Last week, Trump also revoked Harvard's ability to enrol international students or host foreign researchers. A federal judge blocked the policy.

If the measure is ultimately allowed, it could deliver a devastating blow to the university, where more than a quarter of students are from overseas. Students protested against the move at the university's campus near Boston on Tuesday."When President Trump raised import duties by 25% for one-and-a-half years of his first mandate, we lost about $600m [£450m] very quickly," says Jerome Bauer, president of the French National Wines and Spirits Confederation.

"But back then Champagne wasn't included, and neither were wines stronger than 14 degrees of alcohol. So you can see the scale of the threat today."The solution Mr Bauer is backing is free trade. No tariffs. But you'd expect him to say that, given that France and Europe run a big trade surplus with the US when it comes to wines and spirits.

More surprising, perhaps, is the opinion of his American competitors in California and Oregon who, you might think, would be cracking open something a bit special to celebrate."This looks horrible from our perspective. We don't like it one bit," says Rex Stults, vice-president of industry relations at Napa Valley Vintners, which represents 540 wineries in the sunny slopes of California's most famous wine region.