Supporters of legislation that would dictate how and when companies have to notify customers of a data breach are seizing on the hack of 500 million Yahoo accounts to push their effort forward.

“We haven’t hit that sweet spot quite yet, but we’re close. I’m hoping this revelation about Yahoo will provide the needed impetus to get across the finish line,” Sen. John Thune John Randolph ThuneGraham: GOP will confirm Trump's Supreme Court nominee before the election Tumultuous court battle upends fight for Senate What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.D.) told reporters this week.

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Thune, the Commerce Committee chairman, is in talks with a handful of senators, some of whom have competing proposals to address data breach rules.

Data breach legislation generally is seen as the next cybersecurity frontier for Congress, but so far lawmakers have been unable to coalesce around a single proposal.

In the upper chamber, Sens. Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.) and Roy Blunt Roy Dean BluntThis week: Supreme Court fight over Ginsburg's seat upends Congress's agenda McConnell locks down key GOP votes in Supreme Court fight Murkowski: Supreme Court nominee should not be taken up before election MORE (R-Mo.) have put forward a bill that has support from the financial services industry. Commerce Committee ranking member Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.) has put forward a similar offering that mirrors a White House proposal.

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 also circulating a data breach proposal that has yet to be formally introduced but is drawing early support from the retail industry.

Meanwhile, Judiciary Committee ranking member Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Vt.), along with five other Democrats, introduced an offering seen as the preferred option of privacy and consumer advocates.

The picture is equally complicated in the House, where negotiations to merge a companion to the Carper-Blunt offering with an Energy and Commerce Committee proposal supported by retailers have apparently stalled.

Lawmakers for close to 10 years sought to set some kind of national law on data breach notifications much success, until a spate of high-profile retail breaches in 2015 breathed new life into security legislation — creating a glut of options.

The Yahoo breach has drawn particular attention not only for its size — 500 million accounts were exposed by hackers Yahoo says were nation state actors — but for the time the company took to notify victims.

The breach occurred in 2014, with Yahoo only announcing it this month. But reports indicate that the company may have been aware of the hack in July or August of this year.

The timing of the disclosure drew swift criticism from lawmakers who suggested that the company might have sat on the breach to avoid disrupting a purchase deal with Verizon.

“As law enforcement and regulators examine this incident, they should investigate whether Yahoo may have concealed its knowledge of this breach in order to artificially bolster its valuation in its pending acquisition by Verizon,” Sen. Richard Blumenthal (D-Conn.), who backs the Leahy bill, said in a statement.

“This breach demonstrates the urgent need for Congress to enact data breach and security legislation — only stiffer enforcement and stringent penalties will make sure companies are properly and promptly notifying consumers when their data has been compromised.”

All of the various offerings in Congress would set a national standard for security protections, as well as dictate disclosure rules.

But partisan scuffling over whether different proposals would preempt existent state data security regulations have stymied progress.

In the Senate, Leahy’s bill protects stronger state data security requirements, a key sticking point for several Democrats who fear a weak federal standard might lessen consumer protections.

In the House, the Energy and Commerce bill has faced criticism from Democrats who say it would do away with stronger consumer protections at the state level.

The various proposals have also pitted financial services organizations against retailers.

The banking industry is pushing for retailers and others to be held to the same standards financial institutions already have to meet under the Gramm-Leach-Bliley Act.

Retailers, meanwhile, want a federal law to do away with the patchwork of state-by-state regulation — but are wary of having regulations from another industry pasted onto their own. They have publicly supported the Energy and Commerce bill, put forward by Reps. Marsha Blackburn Marsha BlackburnDemocrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections GOP senators unveil new bill to update tech liability protections MORE (R-Tenn.) and Peter Welch Peter Francis WelchShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Vermont Rep. Peter Welch easily wins primary Vermont has a chance to show how bipartisanship can tackle systemic racism MORE (D-Vt.).

The Financial Services Roundtable, meanwhile, backs the Carper-Blunt proposal, introduced by Rep. Randy Neugebauer Robert (Randy) Randolph NeugebauerCordray announces he's leaving consumer bureau, promotes aide to deputy director GOP eager for Trump shake-up at consumer bureau Lobbying World MORE (R-Texas) in the House.

Retailers warn the bill would be overly burdensome to some smaller businesses while allowing other companies — like third-party vendors and financial institutions — to escape regulation altogether.

Thune has not thrown his weight behind any specific proposal, and his office declined to comment on specific members involved in the talks, noting only that he has had discussions with several colleagues and plans additional outreach.

Warner, Carper, Blunt and Nelson are involved, according a Senate aide and an industry source tracking the talks.

A spokesman for Senate Judiciary Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGardner signals support for taking up Supreme Court nominee this year Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee McConnell digs in on vow to fill Ginsburg's Supreme Court seat MORE (R-Iowa) also said that he is part of the talks, as is Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.), according to a congressional source.

The common consensus is that if there is movement on data breach legislation — in either chamber — it is likely to wait until the early part of 2017.

“The question ultimately is, is there the will to do it in the lame duck?” said a retail industry source tracking the issue.

“My sense is that’s not the case, but I think the first part of next year is probably the best time to get that done,” he said, a viewpoint backed up by a Senate aide close to the negotiations.

“We’ve been really close, but it’s complicated and there are a lot of different stakeholders that have different equities in this,” Thune said Tuesday.