Donald Trump picks his targets carefully and seeks to undermine their legitimacy.AP Photo/Alex Brandon Paul M. Collins Jr., UMass Amherst Donald Trump has done it again. And again. In a series of social media posts, the former president personally attacked the daughter of the judge presiding over his criminal trial in New York state. Among other claims, his posts include allegations that the judge’s daughter is a “Rabid Trump Hater, who has admitted to having conversations with her father about me.” Because of this alleged bias, Trump’s attorneys have argued that Judge Juan Merchan cannot be i…