The word is quash.
Squash is produce.
Yes? I think this was meant for someone else? :)
BTW - Greer didn't quash the subpoenas. He just didn't do anything with regard to them. While he would be required to respond to the one to him, he would not be required to respond on Terri's behalf - i.e. the fact that Congress subpoenaed Terri does not mean that Greer would have to go back and modify any prior order that might have an impact on Terri's ability to comply with the subpoena. In other words, the subpoena would not be considered a directive to Greer to order the tube reinserted. Greer would not be responsible for ensuring that Terri complied with the subpoena to her.
It would be no different in a situation where a judge had ordered someone not to leave the state, and that person was later subpoenaed to Washington. While the subpoenaed party could ask the court to lift its order so he/she could comply with subpoena, the court is under no obligation to do so on its own.