WASHINGTON—President Donald Trump on Thursday honored an Oscar-winning actor, a bluegrass-country singer, a conservative think tank and others with two of the most prestigious national awards in the arts and humanities. It was first time Trump has awarded the National Medal of Arts and National Humanities Medal. Honorees included Jon Voight, a Hollywood actor who is an outspoken backer of Trump. Voight, one of four winners of the National Medal of Arts, later accompanied Trump to Dover Air Force Base in Delaware to pay tribute to the remains of two U.S. service members who were killed in a helicopter crash in Afghanistan this week. “Each of todays recipients has made an outstanding contribution to American society, culture and life,” Trump said. “They exemplify the genius, talent and creativity of our exceptional nation.” Voight, who stars in the Showtime drama “Ray Donovan,” won the best actor Oscar for his portrayal of a troubled Vietnam War veteran in the 1978 film “Coming Home”..