The Afghan Taliban released a video on Wednesday showing an Australian and an American hostage pleading with the U.S. government to negotiate with their captors and saying that unless a prisoner exchange was agreed they would be killed.

Timothy Weeks, an Australian teacher at the American University in Kabul and his American colleague Kevin King were seized near the campus in August.

The video, which Weeks said was made on Jan. 1, showed the two men, both bearded, asking their families to put pressure on the U.S. government to help secure their release.

Addressing President-elect Donald Trump, who is due to take office on Jan. 20, Weeks said the Taliban had asked for prisoners held at Bagram air field and at Pul-e-Charkhi prison on the outskirts of Kabul to be exchanged for them.

“They are being held there illegally and the Taliban has asked for them to be released in our exchange. If they are not exchanged for us then we will be killed,” he said.

“Donald Trump sir, please, I ask you, please, this is in your hands, I ask you please to negotiate with the Taliban. If you do not negotiate with them, we will be killed.”

In September, the Pentagon said U.S. forces mounted a raid to try to rescue two civilian hostages but the men were not at the location targeted.

Kidnapping has been a major problem in Afghanistan for many years. Most victims are Afghans and many kidnappers are criminal gangs seeking ransom money but a number of foreigners have also been abducted for political ends.