New Jersey and Pennsylvania are opposing a new Justice Department legal memo that would expose state lottery systems to criminal prosecution.

In amicus briefs filed Wednesday, the states said their lottery and online gambling programs could face shutdown under a 2018 memo issued by the DOJ's Office of Legal Counsel reinterpreting the Wire Act. The states expressed support for the New Hampshire Lottery Commission and a group of lottery vendors, who are asking the U.S. Court of Appeals for the First Circuit to uphold a 2019 decision setting aside that OLC memo.

Pennsylvania and New Jersey argue that the 2018 decision represents an about-face from the government's stance under the Obama administration in 2011, when it said the Wire Act applies only to the use of the wires for sports-related gambling. The states said they relied on that 2011 decision in making significant investments in online lottery and gaming offerings.

"The DOJ's reinterpretation of the Wire Act should be rejected not only because its statutory arguments are flawed, but also because its change of position ignores the harms that would result from reasonable actions taken by the states in reliance on DOJ's 2011 opinion," the New Jersey brief said.

At issue in the case is the weight and significance of OLC memos, which provide regulatory and enforcement guidance to the executive branch. Main Justice told the appeals court that its internal legal opinions are not final agency actions and have no force of law.

"OLC opinions are not final agency action reviewable under the [Administrative Procedure Act] because they are predecisional legal advice and do not themselves determine rights or obligations or impose any legal consequences," the DOJ said.

The power of OLC memos has been a hot topic as of late, with their force and validity coming up in the Mueller probe and President Donald Trump's impeachment proceedings. Opinions from the Office of Legal Counsel have attracted widespread attention in the Trump administration, as Justice Department officials have issued memos arguing why certain high-level officials cannot speak with House Democrats, and also why the president's tax returns cannot be released to congressional investigators.

The Justice Department's policy against indicting a sitting president was established by an OLC memo, an opinion cited by special counsel Robert Mueller III in his report on Russia's interference in the 2016 presidential election and Trump's alleged obstruction of the investigation. No federal judge has ruled on that OLC policy, but it has been questioned in court.

Litigation involving OLC memos is rare. The federal judge in New Hampshire who set aside the OLC memo called it a "mistaken" opinion "that no additional process can cure," sparking the Justice Department's appeal.

Other amicus briefs were filed Wednesday by the Association of Gaming Equipment Manufacturers and International Game Technology, a lottery services company, urging the the appeals court to strike the 2018 memo.

Greenberg Traurig filed Pennsylvania's brief, while New Jersey's was filed by in-house lawyers for the state. Covington & Burling is counsel for the Association of Gaming Equipment Manufacturers, and Sidley Austin represents International Game Technology.

Pennsylvania's brief notes that the DOJ "has refused to renounce" the 2018 opinion. A broad interpretation of the opinion could result in the suspension of most, if not all, state lottery sales, and the loss of over $1 billion in annual proceeds to Pennsylvania, which uses such revenue in programs to benefit older residents.

A less expansive reading of the 2018 opinion could lead to the shutdown of Pennsylvania's iLottery program, which allows the purchase of lottery tickets online, the state's brief said. The lottery relied on the 2011 opinion when it incurred $3.1 million in costs to develop the online platform, and that program is expected to yield nearly $40 million in proceeds this year, the state's brief said.

New Jersey's brief cited several Supreme Court cases holding that an agency's statutory interpretation must be rejected under the Administrative Procedures Act if it reverses a prior interpretation by the same agency without adequately accounting for reasonable reliance interests that have accrued in the interim.

New Jersey expressed concern that the 2018 memo has the potential to end its internet gaming industry, which allows participants to make online wagers on poker, roulette and craps games played in Atlantic City casinos. Since its inception in 2013, internet gaming in New Jersey has created more than 3,300 jobs. It produced $124 million in tax revenue for state and local governments from 2013 to 2016, the state's brief said.

"There is every reason to believe that the DOJ will attempt to prosecute those involved in such transactions in light of the 2018 reinterpretation. And that threat alone, regardless of the merit of such a prosecution, will devastate New Jersey's iGaming industry," New Jersey's brief said.