My cousin overstayed in the US. His passport is expired. US Immigration wants to deport him. How would he get a travel document ? Would you send me the link of the website to download the form ?
As noted in the comments, this is a situation for the Pakistan consulate serving your area (see the "Consulates" tab on this page for a list). Your cousin will surely not be the only person they have seen in such a situation and they should be able to advise on the best way to get travel documents quickly.