"60 MINUTES" FINDS GROUND ZERO IN U.S. ELECTION INFRASTRUCTURE HACK, THIS SUNDAY ON CBS

Illinois Board of Elections Executive Director Steve Sandvoss

Systems Are Still Vulnerable Seven Months before 2018 Midterms and Senate Intelligence Committee Members See Urgent Need to Bolster Cyber Defenses

The threat Russia posed to our democratic process was deemed so great, the Obama Administration took the unprecedented step of using the cyber hotline - the cybersecurity equivalent of the nuclear hotline - to warn the Kremlin to stop its assault on state election systems. Russian operatives had launched a widespread cyberattack against state voting systems around the country. Bill Whitaker goes to Illinois, where election officials were the first to report and defend against the cyber-strike for a 60 MINUTES report to be broadcast Sunday, April 8 (7:00-8:00 PM, ET/PT) on the CBS Television Network.

It began with a call from a staffer at the Illinois Board of Elections headquarters in Springfield to Steve Sandvoss, the executive director. "I picked up the phone. And it's like, 'Steve, we got a problem.' And I said, 'Okay, what happened?' He says, 'We've been hacked.' I said, 'Oh my God.'" The server for the voter registration database, with the personal information of 7.5 million Illinois voters, had slowed to a crawl. The IT team had discovered a malicious attack. "I suppose you could analogize it to a fast-growing tumor - in the system. It was unlike anything we had ever seen," Sandvoss recalls.

Today, seven months from the midterm elections, key members of the Senate Select Committee on Intelligence tell Bill Whitaker much more needs to be done to secure the election infrastructure at the heart of America's democracy. Sen. Kamala Harris (D-Calif.) and Sen. James Lankford (R-Okla.) say the U.S. needs a comprehensive strategy to fight cyber-war but concede upgrading systems around the country by the 2020 presidential election will be a challenge. They are backing legislation to set minimum cybersecurity standards.

"This could be the Iranians next time, could be the North Koreans next time," says Lankford. "This is something that's been exposed as a weakness in our system that we need to be able to fix that, not knowing who could try to test it out next time," he tells Whitaker.

The sweep of the Russian operation in 2016 caught the Obama administration off guard. Michael Daniel, President Obama's cyber czar, envisioned a troubling scenario: hacked voter rolls causing chaos on Election Day. "Lines begin to form. Election officials can't figure out what's going on," says Daniel. "You would only have to do it in a few places. And it would almost feed on itself."

Asked by Whitaker if the government is doing enough to defend the country from the cyber equivalent of a foreign attack on American soil, Sen. Harris says, "No. We're not doing enough."

Follow 60 MINUTES on Twitter, Facebook and Instagram.