The United Kingdom’s government-appointed terrorism watchdog is openly wondering whether President Donald Trump had a point on immigration, as the country grapples with the fallout of a migrant’s attempted beheading of a citizen in Belfast.

Jonathan Hall, the independent reviewer of terrorism legislation, acknowledged on Wednesday that recent trends of violence among immigrants “does raise the question” whether Trump was correct about the “destabilization of Europe” through mass immigration, even if one “may not agree with the language” used by the president.