Tillerson calls for unity as he takes helm at State Department

By Lesley Wroughton WASHINGTON (Reuters) - U.S. Secretary of State Rex Tillerson called for understanding on his first day at the State Department amid internal dissent over policies of President Donald Trump, which have also antagonized a range of allies. Hundreds of State Department officials greeted the former Exxon Mobil Corp chairman with applause as he entered the building. Loud cheers broke out when Tillerson thanked Acting Secretary of State Tom Shannon for standing in after the departur