A steadfast commitment to principles is a VERY HARD thing to beat.
The Dems can whine, cry, complain, and even threaten to cut funds but the reality is, that if they do ANYTHING that disrupts the process, they will take the blame for it.
Video of Iraqi citizens clinging to helicopter landing gear from the top of the US Embassy is something they do not want to live with for the next 30 years.
It doesn't seem to have bothered them for the last 30 years.