President Donald Trump’s sons have in recent months become heavily invested in the defense sector, and ventures they back have reportedly earned billions of dollars in government business as the Trump administration looks to massively boost military spending amid the Iran war.These companies, building technologies ranging from drones to smart factories, have generated at least $3.2 billion in direct government business since Donald Trump Jr. and Eric Trump became involved, a Washington Post analysis found, while the firms stand to potentially access billions more in future contract options.The Post estimates that 97 percent of this windfall has come from SpaceX…