Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.) is calling for legislation that would require tech firms to build their products in such a way that they can crack open encrypted content in response to legal requests from authorities.

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"By taking advantage of widely available encryption technologies, terrorists and common criminals alike can carry out their agendas in cyber safe havens beyond the reach of our intelligence agency tools and law enforcement capabilities. This is unacceptable," the Senate Armed Services chairman writes in a Bloomberg op-ed.

McCain’s proposal would not dictate “what those systems should look like.” Instead, it would require “technological alternatives” to end-to-end encryption, which prevents even the manufacturer from accessing communications.

“This would allow companies to retain flexibility to design their technologies to meet both their business needs and our national security interests,” McCain said.

The proposal comes with lawmakers increasingly divided on the need for legislation to address encryption technology.

The top two members of the House Intelligence Committee said last week that they have not made any decisions about endorsing a bill regulating encryption standards.

“I don’t think we’re any closer to a consensus on that than we were, I think, six months ago,” Rep. Adam Schiff Adam Bennett SchiffOvernight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE, the committee’s top Democrat, said at a Christian Science Monitor breakfast. “Or if there is a consensus, it is that a legislative solution, I think, is very unlikely.”

Following the deadly terrorist attacks on San Bernardino, Calif. and Paris, fears that terrorists were using encryption technology to plan attacks beyond the reach of U.S. surveillance sparked a number of lawmakers to call for new legislation.

Senate Intelligence Committee Chairman Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) is working on a bill with his committee’s ranking member, Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.), that would force companies to decrypt data under court order.

But tech companies and cryptologists have pushed back, arguing that providing any guaranteed access to law enforcement opens up the day-to-day functions of the Internet — like banking — to hackers.

“There have been people that suggest that we should have a backdoor. But the reality is if you put a backdoor in, that backdoor's for everybody, for good guys and bad guys,” Apple CEO Tim Cook said in a December interview with “60 Minutes.”

Last fall, Apple rejected a court order to turn over communications sent using its iMessage feature, citing its encryption system.

McCain alluded to those concerns, but insisted “this is not the end of the analysis.”

“We recognize there may be risks to requiring such access, but we know there are risks to doing nothing,” McCain writes.

He compared his proposal to wiretap laws enacted in the 1990s that required telecommunications providers to “enable law enforcement officials to conduct electronic surveillance pursuant to court order,” but did not dictate the technology’s design.

Some lawmakers have taken a more measured approach. House Homeland Security Committee Chairman Michael McCaul (R-Texas) and 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.) — worry that a bill like Burr’s and Feinstein’s offering would weaken encryption.

They’re pushing legislation that would establish a national committee to study the topic first, then present potential suggestions to Congress about how police could get at encrypted data without endangering Americans’ privacy or security.

McCain echoed FBI Director James Comey, who in recent months has sought to recast the question of how to provide access to encrypted data as a business challenge, not a technological one.

“We have to encourage companies and individuals who rely on encryption to recognize that our security is threatened, not encouraged, by technologies that place vital information outside the reach of law enforcement,” McCain wrote.

“Developing technologies that aid terrorists like Islamic State [in Iraq and Syria] is not only harmful to our security, but it is ultimately an unwise business model.”