[Politico] Of the many senior officials to leave the Trump administration over the past two years, few have exited on better terms than former United Nations Ambassador Nikki Haley. Before her departure last December, President Donald Trump feted Haley with an Oval Office photo-op and declared that his U.N. diplomat "has been very special to me."And while many former Trump officials, from former White House chief of staff John Kelly to former Secretary of State Rex Tillerson and former Defense Secretary Jim Mattis, have kept a low profile in the private sector, Haley is charting a different course. She is emerging as a fundraiser and surrogate for 2020 Republican Senate candidates, and next month will begin zigzagging across the country to campaign for a trio of GOP senators.