US President Joe Biden is on his way to Northern Ireland and Ireland, marking the 25th anniversary of the Good Friday Agreement, despite a "severe" threat level being raised.

Sky News' David Blevins examines previous US presidents' visits, and why this trip is sparking particular concerns over security.

Biden latest: https://news.sky.com/story/joe-biden-visit-latest-us-president-to-travel-to-northern-ireland-today-policing-operation-biggest-in-a-decade-12851061

#bideninireland #bidenbelfast #bidenirish

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