President Donald Trump told Denmark ’s prime minister he is serious about taking over Greenland in a “fiery” phone call last week, the Financial Times reports. Trump and Mette Frederiksen spoke on the phone for 45 minutes last week after the president said he wanted the US to take Greenland, despite officials repeatedly saying it’s not for sale.

President Trump had a “firm” phone conversation with Denmark’s prime minister last week to convey his serious intentions of acquiring Greenland, according to a report citing officials privy to the talk.