Washington's objective is to support West Africa's regional bloc ECOWAS in its efforts to reverse the takeover, the senior State Department official said, speaking on condition of anonymity.
"We don't think it's fully successful, and we think there's a narrow opportunity to reverse it," the official told reporters.
ECOWAS on Sunday gave Niger coup leaders one week to reinstate ousted Bazoum or face sanctions and the possible use of force.
A change in government would affect Washington's ability to engage in Niger, though there are some exceptions to the law for counterterrorism, the official said.
Niger and its neighbors Mali, Burkina Faso, Nigeria and Chad are all struggling to repel Islamist insurgents.
Persons:
Mohamed Bazoum, Bazoum, Washington, Daphne Psaledakis, Humeyra Pamuk, Simon Lewis, Marguerita Choy
Organizations:
West, ECOWAS, senior State Department, Sunday, Islamic, ., U.S, Thomson
Locations:
Niger, U.S, West, Central Africa, France, Islamic State, al Qaeda, Mali, Burkina Faso, Nigeria, Chad