Anyone detained by any government agency has the right to file a habeas petition. It's a very fundamental right and applies to non-citizens as well. The differ

Anyone detained by any government agency has the right to file a habeas petition. It's a very fundamental right and applies to non-citizens as well. The difference, insofar as courts have decided to date, is that citizens have this right even when they are detained outside of US borders, while non-citizens only have it when detained within those borders (and generally wherever the US govt has "ultimate sovereignty", e.g. Gitmo).