A former Danish prime minister has criticized U.S. President Donald Trump over a recent Twitter message about military spending. Lars Loekke Rasmussen said that defense willingness is not just about the amount of money spent. His comments are the latest in a growing argument between American and Danish politicians. Trump announced on Tuesday he was canceling his planned visit to Denmark because current Danish Prime Minister Mette Frederiksen was “nasty” when she wholly rejected his idea of buying Greenland. Loekke Rasmussen led the country until June, when Frederiksen took office. The former leader tweeted to Trump on Thursday: “We have had, proportionally, exactly the same numbers of casualties in Afghanistan as US. We always stand firm and ready.”