U.S. diplomats are reaching the final stages of a negotiation over Taliban obligations not to shelter terrorists if American forces leave Afghanistan, according to Secretary of State Mike Pompeo.

“In light of this progress, we’ve begun discussions with the Taliban regarding foreign military presence, which today remains conditions-based,” Pompeo told reporters during an unannounced trip to Kabul. “And while we’ve made clear to the Taliban that we are prepared to remove our forces, I want to be clear we have not yet agreed on a timeline to do so.”