The U.S. dollar fell to a more than two-week low against the Japanese yen on Friday as investors doubted the likelihood of swift tax reform and a quick spending boost from U.S. President Donald Trump's administration. On Thursday, U.S. Treasury Secretary Steven Mnuchin suggested that much work was still needed on key elements of a tax reform plan, one of the policies investors had anticipated would spur inflation and drive up U.S. interest rates. Analysts noted that Federal Reserve meeting minutes released on Wednesday reinforced doubts about a rate hike next month since voting members showed much less urgency to tighten credit