In April 2016, he was one of eight former Treasury secretaries who called on the United Kingdom to remain a member of the European Union ahead of the June 2016 Referendum. In June, Paulson announced his support for the stop Trump movement and endorsed Hillary Clinton for the presidency. In his op-ed to "The Washington Post" Paulson wrote, "The GOP, in putting Trump at the top of the ticket, is endorsing a brand of populism rooted in ignorance, prejudice, fear and isolationism."