By Humeyra Pamuk and Bo EricksonWASHINGTON, March 16 (Reuters) - U.S. Vice President JD Vance on Monday expressed support for the way President Donald Trump was handling the war in Iran and said he trusted him to make sure that "the mistakes of the past" are not repeated.Vance's comments appeared to be an effort to counter questions about whetherhis well-known anti-war and isolationist views put him at odds with Trump. Since the war began on February 28, Vance had not publicly offered unequivoca...