The U.S. has proposed a peace agreement for Afghanistan to enter an interim power-sharing government with the Taliban.
The Biden administration hopes the proposal is a jump-start for negotiations.
The agreement includes a cease-fire and protections for women's rights, children and minorities.
"It's absolutely true that the United States has sought out ideas to advance the prospects for peace, the prospects to galvanize a durable peace and again, a durable peace that must be Afghan-led and Afghan-owned," said State Department spokesperson Ned Price.
Secretary of State Antony Blinken wrote the letter and said withdrawing troops from the region on May 1 is still on the table.