U.S. stock futures were fluctuating on Thursday following Wednesday’s record advances. Futures of major benchmark indices were mixed.The Donald Trump administration has reportedly warned that the shutdown could cut $15 billion from weekly GDP and leave 43,000 more people jobless if it lasts a month. After the Senate rejected competing government funding bills from both Republicans and Democrats on Wednesday, the next opportunity to hold a vote will be on Friday. The chamber will be out on Thursday in observ ...