svg]:overflow-visible">Listen to article • 0:00 minA group of Democratic lawmakers have asked the Pentagon’s official watchdog to open an investigation after the Washington Post revealed that 15 companies with investment from President Donald Trump’s sons have garnered $3.2 billion in federal contracts, investments, and loans — most coming after Trump took office for the second time.The letter from Sens. Elizabeth Warren (Mass.), Richard Blumenthal (Conn.), Tammy Duckworth (Ill.), and Rep. Robert Garcia (Calif.) asks for an inquiry into Defense Department contracts awarded to companies affiliated with Eric and Donald Trump Jr., according to a copy of the request provided to the…