Visitors pay their respects to late former U.S. President George H.W. Bush lying in state in the U.S. Capitol Rotunda, in Washington D.C., the United States, on Dec. 4, 2018. The coffin of late former U.S. President George H.W. Bush was flown to Washington D.C. on Monday as the nation is paying tribute to him and his legacy. (Xinhua/Liu Jie)