Metaphorically, the mask fell off when, during the 2016 electoral campaign, the face behind it spoke of "tariffs" - essentially just another synonym for taxes.
relevant info link: http://www.politifact.com/truth-o-meter/article/2016/jun/21/donald-trump-has-floated-big-tariffs-what-could-im/
RE: The Trumpeymoon Is Over