A legal, permanent resident immigrant with a prior criminal record, has been ordered deported, and the Supreme Court has upheld the deportation order.  Because it’s the law.

Writing for the Court, Justice Brett Kavanaugh had this [emphasis added]:

Removal of a lawful permanent resident from the United States is a wrenching process, especially in light of the consequences for family members. Removal is particularly difficult when it involves someone such as Barton who has spent most of his life in the United States. Congress made a choice, however, to authorize removal of noncitizens—even lawful permanent residents—who have committed certain serious crimes. And Congress also made a choice to categorically preclude cancellation of removal for noncitizens who have substantial criminal records. Congress may of course amend the law at any time. In the meantime, the Court is constrained to apply the law as enacted by Congress.