Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) grilled a Facebook executive on Tuesday, asking why the company wasn't able to discover foreign election interference when it had sold political ads to accounts that paid in Russian rubles.

"People are buying ads on your platform with rubles," Franken said, his voice rising. "They’re political ads. You put billions of data points together all the time — that’s what I hear that these platforms do."

Stretch admitted that the company was policing advertisers for other abuses and that it failed to connect the dots on the two variables.

“Senator, it’s a signal we should have been alert to, and in hindsight it’s one we missed,” Stretch said.

But despite repeated attempts by Franken, Stretch would not commit to saying Facebook would stop accepting foreign currencies for U.S. political ads.

Franken zeroed in on Facebook General Counsel Colin Stretch during a Senate Judiciary subcommittee hearing on online Russian disinformation campaigns.