Mitt Romney will deliver a major foreign policy speech at the Citadel in Charleston, S.C., Friday.

Romney made his announcement on Sean Hannity’s radio show this afternoon.

Romney said he will talk about a “very different vision” and what changes to put in place to keep America leading of the world.

The speech “will be the broadest, most in depth foreign policy discussion of anyone in this race” and will be about ”America leading the world,” according to a Romney adviser.

Romney’s foreign policy platform is “very different than Obama” and his speech will focus “less on [Afghanistan] and more on the world,” the adviser added.