U.S. President Donald Trump's choice to lead the Labor Department admitted to employing an undocumented immigrant as a house cleaner, the kind of revelation that derailed Cabinet nominees in previous administrations. Andrew Puzder, chief executive officer of CKE Restaurants Inc, is one of several Trump nominees who face strong opposition from Senate Democrats and progressive groups. In a statement late on Monday, Puzder said he and his wife had employed a housekeeper for a few years without being aware that she was not legally permitted to work in the United States. "When I learned of her status, we immediately ended...