US President Donald Trump suggested on Friday that he may punish countries with tariffs if they don’t back the US controlling Greenland, a message that came as a bipartisan Congressional delegation sought to lower tensions in the Danish capital. Trump for months has insisted that the US should control Greenland, a semi-autonomous territory of Nato ally Denmark, and said earlier this week that anything less than the Arctic island being in US hands would be “unacceptable”. During an unrelated...