WARSAW — Poland, one of the closest U.S. allies in Europe, was blindsided by this week's surprise decision from Pentagon chief Pete Hegseth to cancel the planned deployment of 4,000 American troops to the country.   The government is now scrambling to respond while insisting that the move doesn't undermine the country's security. The Polish-American alliance is “durable and lasting," Defense Minister Władysław Kosiniak-Kamysz said on Friday. "Poland continues to be the most stable American ally