Kerry Says Mexico Won't Pay for Wall and Not to Do Diplomacy by Tweet

Secretary Kerry sat down for an interview with ABC News.

Kerry also commented on Trump's discussion of policy on Twitter, telling Raddatz that he doesn't think the social media platform is an appropriate forum for discussing U.S. foreign policy.

"I don't make announcements of foreign policy by tweet, Twitter. I don't think that, you know, 140 characters allows you to adequately deal with the complexity of many of the choices that we make," Kerry said.

He said he doesn't want to engage in back-and-forth with Trump and his team on the issue but hopes that they decide to "move to a different way of communicating."

Trump tweets almost daily on topics as mundane as reality television and as serious and geopolitically sensitive as tensions between China and Taiwan.