President Trump is threatening to block the opening of a bridge between Canada and Michigan. The Gordie Howe International Bridge connecting Detroit and Windsor, Ontario, is scheduled to open this year. But the president said he “will not allow it” to open until the United States “is fully compensated for everything we have given them.” He wrote online that Canada has treated the U-S “very unfairly for decades.” The bridge, which has cost more than 4-and-a-half billions dollars to build, has been financed by Canada and will be jointly owned by Canada and Michigan. GC, Wash.