FILE - In this Feb. 23, 2015, file photo, Sen. Elizabeth Warren, D-Mass. applauds as President Barack Obama makes the thumbs up sign as he arrives to speak at AARP in Washington. When Obama huffed that Warren was a "politician like everybody else" he revealed a rift that predates the current hostilities between the two Democrats over trade. Though occasional allies, Warren has been aggravating the Obama administration since her pre-Senate days when she chaired an oversight panel charged with being a watchdog over the massive federal bank bailout. (AP Photo/Jacquelyn Martin, File)