A fresh legal opinion challenging President Donald Trump’s hold on Ukraine military aid under a Nixon-era budget law may or may not move the needle with senators in the president’s impeachment trial.

But one thing is clear: Trump’s delay of $214 million in Pentagon funds is just the latest in a long line of findings by the Government Accountability Office going back decades that presidents of both parties have run afoul of the 1974 law. That statute was aimed at restricting “impoundments,” where the executive branch refuses to spend money appropriated by Congress.

The only sanction or penalty, however, is going to court to force release of said funds, an option rendered moot when the money is ultimately released, as it typically has been — just not on the timetable lawmakers envisioned. That fact has led to a resurgence of interest in changing the law itself to give it some actual teeth.

Barry Anderson, a former top official at the Office of Management and Budget and Congressional Budget Office, said he sees merit in attempts to beef up enforcement of the law. As it stands now, Anderson said, “GAO is waving their finger, saying ‘You’re bad.’ But so what?”

House Budget Chairman John Yarmuth told CNN last week after the GAO’s Ukraine aid finding that legislation is needed because under current law “there really is no recourse” to correct an illegal impoundment.