WASHINGTON (AP) - Under sharp criticism from senators, a Facebook executive on Tuesday defended the social network’s ambitious plan to create a digital currency and pledged to work with regulators to achieve a system that protects the privacy of users’ data.

“We know we need to take the time to get this right,” David Marcus, the Facebook executive leading the project, told the Senate Banking Committee at a hearing.

But that message did little to assure senators. Members of both parties demanded to know why a company with massive market power and a track record of scandals should be trusted with such a far-reaching project, given the potential for fraud, abuse and criminal activity.

“Facebook is dangerous,” asserted Sen. Sherrod Brown of Ohio, the committee’s senior Democrat. Like a toddler playing with matches, “Facebook has burned down the house over and over,” he told Marcus. “Do you really think people should trust you with their bank accounts and their money?”

Republican Sen. Martha McSally of Arizona said “the core issue here is trust.” Users won’t be able to opt out of providing their personal data when joining the new digital wallet for Libra, McSally said. “Arizonans will be more likely to be scammed” using the currency, she said.

The litany of criticism came as Congress began two days of hearings on the currency planned by Facebook, to be called Libra. Meanwhile, a House Judiciary subcommittee extended its bipartisan investigation of the market power of Facebook, Google, Amazon and Apple.

On the defensive from bursts of aggressive questioning, Facebook’s Marcus indicated the currency plan is a work in progress. “We will take the time” to ensure the network won’t be open to use by criminals and illicit activity like money laundering and financial fraud. “We hope that we’ll avoid conflicts of interest. We have a lot of work to do,” Marcus said.

He said the new venture would be headquartered in Switzerland, not to avoid oversight but because the country is a recognized international financial center.

The grilling followed a series of negative comments and warnings about the Libra plan in recent days from President Donald Trump, his treasury secretary and the head of the Federal Reserve.

But some senators emphasized the potential positive benefits of Facebook’s plan, meant to bring money transacting at low cost to millions around the globe who don’t have bank accounts. Facebook had its strong defenders of the project, too, on the panel.

“To strangle this baby in the crib is wildly premature,” said Sen. Pat Toomey, R-Pa.

In that vein, Marcus said Libra “is about developing a safe, secure and low-cost way for people to move money efficiently around the world. We believe that Libra can make real progress toward building a more inclusive financial infrastructure.”

The planned digital currency is to be a blend of multiple currencies, so that its value will fluctuate in any given local currency. Because Libra will be backed by a reserve, and because the group of companies managing it will encourage a competitive system of exchanges, the project leaders say, “anyone with Libra has a high degree of assurance they can sell it for local (sovereign) currency based on an exchange rate.”

Promising low fees, the new currency system could open online commerce to millions of people around the world who lack access to bank accounts and make it cheaper to send money across borders. But it also raises concerns over the privacy of users’ data and the potential for criminals to use it for money laundering and fraud.

To address privacy concerns, Facebook created a nonprofit oversight association, with dozens of partners including PayPal, Uber, Spotify, Visa and MasterCard, to govern Libra. As one among many in the association, Facebook says it won’t have any special rights or privileges. It also created a “digital wallet” subsidiary, Calibra, to work on the technology, separately from its main social media business. While Facebook owns and controls Calibra, it won’t see financial data from it, the company says.

Senators demanded to know exactly what that separation will entail.

“Facebook isn’t a company; it’s a country,” said Sen. John Kennedy, R-La. Kennedy and other conservative senators took the occasion to air long-standing grievances against Facebook, Twitter and Google for a perceived bias against conservative views.

Facebook’s currency proposal has also faced heavy skepticism from the Trump administration.

Trump tweeted last week that the new currency, Libra, “will have little standing or dependability.” Both Treasury Secretary Steven Mnuchin and Fed Chair Jerome Powell have expressed serious concerns recently that Libra could be used for illicit activity.

The Treasury Department has “very serious concerns that Libra could be misused by money launderers and terrorist financers,” Mnuchin told reporters at the White House on Monday. “This is indeed a national security issue.”

Also Tuesday, across the Capitol in the House, the chairman of a Judiciary Committee panel investigating the market power of big tech companies said Congress and antitrust regulators wrongly allowed them to regulate themselves. That enabled companies like Facebook, Google, Amazon and Apple to operate out of control, dominating the internet and choking off online innovation, Rep. David Cicilline, D-R.I., said at the start of a hearing.

“The internet has become increasingly concentrated, less open, and growingly hostile to innovation and entrepreneurship,” he said.

As concerns have mounted over data privacy and market dominance of Big Tech, an increasing number of lawmakers from both parties are calling for tighter regulation of customarily free-wheeling companies or even breaking them up. The Justice Department and the Federal Trade Commission are pursuing antitrust investigations of the four major companies.

Executives of the companies, testifying at the Judiciary hearing, pushed back against lawmakers’ accusations that they operate as monopolies, laying out ways in which they say they compete fairly yet vigorously against rivals in the marketplace.

And Google executive Karan Bhatia, at a Senate Judiciary subcommittee hearing on online bias, insisted that the company’s search engine does not filter on the basis of political views. “We surface the results that are most responsive,” he said. “We don’t use political (markers) to blacklist or whitelist.”

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