Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.) is pressing Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE to review a controversial Department of Justice opinion from 2011 that changed its long-held stance on online gambling.

In a letter to Sessions dated July 5, Warner wrote that online gambling sites “are especially fertile platforms for the facilitation of money laundering, collusion and other illegal activities,” citing FBI findings.

He argued the “potentially predatory nature of online gambling represents a heightened threat to economically vulnerable populations.”

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Sessions questioned the validity of the Office of Legal Counsel's opinion during his Senate confirmation hearing, which stated that the 1961 Wire Act only applied to sports betting.

Sessions told lawmakers he was “shocked” by what he called the “unusual” memo and pledged to take a look at it as attorney general.

He opposed it as a Republican member of the Senate when it was issued five and a half years ago.

“I would revisit it or make a decision about it based on careful study,” he said during his confirmation hearing.

Lawmakers are ramping up pressure on Sessions in hopes the department will reverse the 2011 opinion, which has opened the door to legalized online gambling in various states.

“The OLC opinion appears to be based on legal interpretation alone and does not provide background on the extent to which consideration was given to social, economic and law enforcement implications,” Warner wrote.

Two members of the Senate Judiciary Committee, ranking Democrat Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (Calif.) and Sen. Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (R-S.C.), have weighed in with Sessions as well.

They wrote to him in May to express hope that Justice will “restore the department’s longstanding practice of enforcing the Wire Act against online gambling by revoking the opinion.”

Three Republicans, Sens. Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (Ark.), Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) and Graham, last year introduced legislation to bar financial services companies from processing internet gambling proceeds.

Former Senate Democratic Leader Harry Reid Harry Mason ReidGraham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' Senate Republicans signal openness to working with Biden MORE (D-Nev.) was a leading advocate of curbing online gambling before he retired at the end of last year.

Reid, however, backed off pushing for an online gambling ban during last year’s lame-duck session.

Republican mega-donor and casino magnate Sheldon Adelson is a leading advocate for curbing online gambling.

He gave $20 million to a super PAC allied with Senate Republicans last year, The Washington Post reported in September.

The Post noted that Cotton, Lee and Graham introduced their bill a day after Adelson’s contribution became public.