U.S. stock futures were mixed on Tuesday after a higher close on Monday.On Monday, Overall, U.S. markets finished higher—with the Dow Jones jumping nearly 600 points to a fresh all-time high—following weekend raids in Venezuela that resulted in the capture of President Nicolás Maduro.This comes amid the Donald Trump administration's plans to meet with top oil industry executives later this week to discuss boosting Venezuela's oil output in a U.S.-led effort, according to a Reuters report.Meanwhile, the 10-y ...