A major donor to New York City's mayor testified Thursday that he gave money to Bill de Blasio’s campaign fund in exchange for access and favors. Jona Rechnitz, 34, a felon who pleaded guilty in March to making contributions in exchange for favors from government officials, made the claim when he appeared as a witness in the corruption trial of former city correction-union chief Norman Seabrook. Rechnitz is accused of bribing Seabrook to invest $20 million in union pension money in a friend’s hedge fund, the New York Post reported. But the topic quickly moved on to de Blasio, with...