A friend and advisor to socialist New York City Mayor Zohran Mamdani met with the president of Cuba during a luxe trip to the communist nation — where they conspired to subvert US foreign policy, according to a since-deleted travel diary obtained by The Post. Danny Valdez, who hosted a fundraiser for Mamdani’s mayoral campaign in 2025, traveled to Cuba with a delegation from the DSA International Committee from Oct. 22 to Oct. 26, 2023, according to the Nov. 9, 2023 blog post, entitled “The Cuba Diaries.” The delegation met with President Miguel Diaz-Canel on the third day of the...