The Department of Homeland Security is investigating a nonprofit with connections to New York City Mayor Zohran Mamdani for potentially providing donor funds to a sanctioned Palestinian group, the New York Post reported Friday.The report says federal authorities are probing the U.K.-based organization known only as PFF, which has a roughly $100 million war chest used to support anti-Israel causes. It also may have contributed donor funds to Al-Haq, a Palestinian group sanctioned by the U.S., the Post reported."A new fund set up by Arabs across the US, UK, and Australia has been built to take o...