Senate Democrats want White House chief strategist Stephen Bannon to clarify recent contact he's had with Breitbart News, the conservative outlet he once ran. The senators also want to know if Bannon's contact with the site complies with ethics rules. Democratic Sens. Elizabeth Warren (Mass.), Ed Markey (Mass.), Mazie Hirono (Hawaii) and Sheldon Whitehouse (R.I.) sent letters Thursday to Bannon and Stefan Passantino, the White House's designated agency ethics official.