Donald Trump’s administration is reportedly preparing to send thousands of illegal immigrants to the military prison at Guantanamo Bay, Cuba, as soon as this week, marking a rapid escalation of the president’s mass deportation agenda which could target hundreds of people from European allied countries.

Immigration officials are considering whether to transfer as many as 9,000 foreign nationals, including people from the United Kingdom as well as Ireland, Italy, France, Germany, Belgium, the Netherlands, Lithuania, Poland, Turkey and Ukraine, according to reporting from The Washington Post and Politico.