U.S. House Speaker Pelosi announces formal impeachment inquiry against Trump

U.S. House Speaker Nancy Pelosi (front) walks to her office on Capitol Hill in Washington D.C., the United States, on Sept. 24, 2019. Nancy Pelosi announced Tuesday the initiation of a formal impeachment inquiry against President Donald Trump over the latter's controversial phone call with the Ukrainian president. (Photo by Ting Shen/Xinhua)