Corey Lewandowski, former campaign manager for U.S. President Donald Trump, is sworn in to testify before the U.S. House Judiciary Committee on Capitol Hill in Washington D.C., the United States, on Sept. 17, 2019. Corey Lewandowski showed an uncooperative attitude on Tuesday at a congressional hearing on alleged presidential obstruction of justice and abuse of power. (Xinhua/Liu Jie)