Why did John McCain think presidential talks with Iran were a bad idea?

John McCain believed that presidential talks with Iran without preconditions would be counterproductive and could legitimize a regime he viewed as hostile and aggressive. He argued that engaging in direct dialogue could undermine U.S. allies in the region, particularly Israel, and send the wrong message about Iran's actions, including its nuclear ambitions and support for terrorism. McCain felt that a firm stance was necessary to hold Iran accountable and protect American interests.