To amend the National Defense Authorization Act for Fiscal Year 2017 to clarify certain responsibilities of the Global Engagement Center of the Department of State, and for other purposes.

Global Engagement Center Authorities Act of 2018 This bill revises provisions relating to the Global Engagement Center and its role in countering foreign and non-state propaganda and disinformation efforts aimed at undermining the policies, security, or stability of the United States and its allies and partner states. It also modifies the center's grant program for assisting specified entities in countering such propaganda and disinformation efforts. The Department of State shall brief Congress at least annually on the activities of the center.