A lawyer allied with Donald Trump is expected to testify Monday before a New York grand jury, giving the former president an indirect opportunity to make a case that he shouldn't face criminal charges over hush money paid during his 2016 campaign.
Robert Costello was asked to appear by the Manhattan district attorney's office after he said he had information raising questions about the credibility of Michael Cohen, a key witness in the investigation, according to a person familiar with the matter who insisted on anonymity to discuss secret legal proceedings.
