In a letter to chairman and chief executive Mark Zuckerberg, South Dakota Sen. John Thune requested information on who at the company made the decisions on stories for Facebook's Trending Topics feature, what training is provided to employees, whether the company is investigating and what steps it will take to hold people accountable. "If Facebook presents its Trending Topics section as a result of a neutral, objective algorithm, but it is in fact subjective and filtered to support or suppress particular political viewpoints, Facebook's assertion that it maintains 'a platform for people and perspectives from across the political spectrum' misleads the public," wrote Thune, who chairs the Senate Commerce, Science and Transportation Committee. "The Republican Senate refuses to hold hearings on (Supreme Court nominee) Judge (Merrick) Garland, refuses to fund the president's request for Zika aid and takes the most days off of any Senate since 1956, but thinks Facebook hearings are a matter of urgent national interest," Jentleson said.