US President Joe Biden on Sunday called on Afghanistan's Taliban rulers to release a US civil engineer who was abducted two years ago and is believed to be the last American hostage held by the Taliban.

Mark Frerichs, a 59-year-old US Navy veteran from Lombard, Illinois, who worked in Afghanistan for a decade on development projects. He was kidnapped a month before the February 2020 US troop pullout deal was signed and was transferred to the Haqqani network, a brutal Taliban faction accused of some of the deadliest attacks of the war.

Monday marks his second year in captivity...