Former special U.S. envoy to Afghanistan Zalmay Khalilzad said the United States “still ha[s] unfinished business in Afghanistan” on “The Story with Martha MacCallum” Friday in light of the Taliban’s takeover of the country last August.

“The agreement that we made – which was condition-based under…[former President Donald] Trump[‘s] administration – some of those conditions have not materialized.,” the author of “The Envoy: From Kabul to the White House, My Journey Through a Turbulent World” said. “The Taliban have not implemented those. We want to hold the Taliban accountable for those agreements. …I advocated that rather than disengaging, we need to press the Taliban to negotiate and reach an agreement on the implementation of the remaining parts dealing with terrorism…[and] the establishment of a broad-based government.”

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Khalilzad said he worried that “we were turning our back and not doing what we needed to do to protect the American interests still in Afghanistan.”

He argued that although President Biden’s administration is “concerned” about combatting terrorism, it will fester in an ungoverned environment if Afghanistan falls apart under the Taliban. The Biden administration is not negotiating with the Taliban because of its perception as a terrorist group, he said.

The former U.S. ambassador to the United Nations said the Taliban “want[s] normalcy in relations” with the U.S. and “the funds of Afghanistan and the [U.S.] to be unfrozen.”