In a statement issued on Sunday, the State Department said Khalilzad, who has undertaken extensive recent talks with the Taliban, would head an inter-agency delegation from February 10 to 28.
It was unclear whether the group had already left at the time of the statement.
Khalilzad thanks Pakistan for facilitating talks with Afghan Taliban
The itinerary will take the US delegation to Belgium, Germany, Turkey, Qatar, Afghanistan and Pakistan, the statement said, adding that Khalilzad would "consult with the Afghan government throughout the trip."
The emphasis on bringing "all Afghan parties together" appeared crucial. US-Taliban peace talks have not included the Afghan government, which the Taliban considers US-backed puppets, and Khalilzad said recently that intra-Afghan negotiations were essential.
The US envoy has in recent months met several times with Taliban officials in Qatar, where the group's leaders have an office in the capital Doha.
Khalilzad said Friday that he hoped to see a peace deal in place before Afghanistan's July presidential elections.
President Donald Trump has been pushing to end US involvement in Afghanistan, where 14,000 American troops are still deployed. But Khalilzad emphasized that any troop withdrawal would depend on conditions on the ground.
US envoy seeks peace deal in Taliban talks before Afghan elections
He has held a series of meetings with the Pakistani leadership as part of Washington’s renewed push to bring the Afghan Taliban to the negotiating table.
The latest push for a peace came after President Donald Trump wrote a letter to Prime Minister Imran Khan, seeking Pakistan’s help for the negotiated settlement of the Afghan conflict.
In the letter, the United States had sought PM Imran's full support to advance Afghan peace process. The correspondence came after Trump accused Pakistan of "doing nothing" despite receiving "billions of dollars" in aid.
Acting Pentagon chief arrives in Afghanistan
Acting Pentagon chief Patrick Shanahan arrived in Afghanistan on a surprise visit Monday as the United States seeks to support the Kabul government while negotiating peace with the Taliban.
Shanahan will meet President Ashraf Ghani, whose government was not part of major talks between US and Taliban officials last month that negotiators hope could bring a breakthrough in the grinding 17-year conflict.
No timetable for US withdrawal from Afghanistan, asserts Khalilzad
He reinforced US support for the Kabul government before touching down in the Afghan capital.
"It's important that the Afghan government is involved in discussions regarding Afghanistan," Shanahan told reporters on the flight. "The Afghans have to decide what Afghanistan looks like in the future. It's not about the US, it's about Afghanistan."
Shanahan will meet General Scott Miller, the top US and NATO commander in Afghanistan, during his visit.
"I have not been directed to step down our forces in Afghanistan," Shanahan said. "I think the presence we want in Afghanistan is what assures our homeland defence and supports regional stability."
The US is expected to resume talks with Taliban officials in Doha, where the insurgents have their political office, on February 25.
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