The FBI has obtained secret wiretaps collected by Spanish police of conversations involving Alexander Torshin, a deputy governor of Russia’s Central Bank who has forged close ties with U.S. lawmakers and the National Rifle Association, that led to a meeting with Donald Trump Jr. during the gun lobby’s annual convention in Louisville, Ky., in May 2016, a top Spanish prosecutor said Friday. Jose Grinda, who has spearheaded investigations into Spanish organized crime, said that bureau officials in recent months requested and were provided transcripts of wiretapped conversations between Torshin and Alexander Romanov, a convicted Russian money launderer. On the wiretaps,...