PORT HURON, Michigan, Oct 25 (Reuters) - US President Donald Trump on Sunday escalated his invective against Norway, calling it a "shit house country" and saying Norwegian immigrants were not welcome in the United States because the Nobel committee, based in the capital Oslo, had not awarded him a Peace Prize. Trump made the comments at a political rally in Port Huron, Michigan, ahead of next week's midterm elections Attributing recent unrest in France to immigration, Trump said he would welcome immigrants from some countries but not from Norway "because I didn't get the Nobel Prize ... So I don't...