He promised an "organized resistance" to Taliban rule. Now he wants U.S. help to lead that fight.

While the Taliban's dramatic takeover of Afghanistan was met with little resistance, clear signs of defiance were appearing on Thursday.

In an op-ed published in The Washington Post, the son of Afghanistan's most famed anti-Taliban fighter claimed to have the forces to mount an effective resistance, but he called on the United States to supply arms and ammunition to his militia.