In June 2015, Tapper became host of CNN's Sunday political show, State of the Union with Jake Tapper. There, he has become known for challenging politicians of all stripes, including challenging Senator Bernie Sanders to release his tax returns;[28] asking Jeb Bush why Hillary Clinton is responsible for Benghazi if his brother George W. Bush bears no responsibility for the terrorist attacks on 9/11;[29] asking Hillary Clinton about the FBI investigation into her private email server;[30] and asking Donald Trump if he would denounce support from white supremacists, the Ku Klux Klan, and David Duke[31] – referred to days later as "the infamous Tapper-Trump exchange" by Mitt Romney[32] in his March 2016 speech condemning Trump.