Former US Treasury Secretary and Wall Street Week contributor Lawrence H. Summers discusses President Trump's on-again, off-again negotiation tactics on tariffs. Bloomberg News Head of Economics and Government Stephanie Flanders Stephanie Flanders draws on the president's real estate track record, calling him someone who "overturns the chessboard and unsettle his adversaries." -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't