Prosecution says ex-Wall Street banker lied in insider trading trial

U.S. prosecutors on Monday sought to brand a former Wall Street investment banker as a liar after he took the stand in his own defense to deny engaging in a years-long insider trading scheme with his father. In her closing argument, Assistant U.S. Attorney Sarah McCallum urged a federal jury in Manhattan to reject a "web of lies" conveyed during testimony by Sean Stewart, an ex-banker at Perella Weinberg Partners and JPMorgan Chase & Co. While Stewart may have in violation of his employers'