Two top Senate Democrats are pressing the government to explain how Donald Trump's federal lease to operate a luxury hotel near the White House can go forward despite what they call the "unmanageable conflicts of interest" presented by the president becoming his own landlord — as well as a provision that bans government officials from the deal. Sen. Elizabeth Warren of Massachusetts joined with Sen. Tom Carper of Delaware, ranking Democrat on the committee that oversees government operations, in sending a letter Thursday to the General Services Administration, which in 2013 awarded a lease to the Trump organization to redevelop...