The blank department is tasked with promoting the presidents foreign policies regarding other sovereign nations.

The answer is Department of State.

Explanation: The Department of State is responsible for promoting the foreign policies of the President and the relations with other sovereign countries. The executive brunch and the Congress have the constitutional responsibilities for the US foreign policy. The executive brunch is the Department of state. They help President to make the foreign policy and they promote the policies.

maybe you need to work on the pipes in the house. i am just saying this because you did not give any details.