A fired up Edward J. Markey vowed today to defeat President Trump's rollback of the Deferred Action for Childhood Arrivals program, known as DACA, with the senator saying he won't quit until the program is restored.“I will continue to fight every single day on the Senate floor until we pass the legislation that reverses the Trump decision to harm these young people in our country,” Markey said during a press conference at a Boston immigrant advocacy office.