U.S. President Donald Trump on Thursday canceled a planned visit to the World Economic Forum in Davos, Switzerland, later this month amid a shutdown of the federal government, signaling he was prepared for the political showdown to stretch into late January.<br />It was unclear whether the partial government shutdown, now in its 20th day, would end before the start of the global economic meeting, which is scheduled for Jan. 22 to 25. <br />
