National: 2020 presidential election: What the NSA is doing to prepare and how the agency tackled the 2018 midterms | Olivia Gazis/ CBS News

The National Security Agency has begun revealing some of its preparations for the 2020 presidential elections, drawing in part from from its previous successes during the 2018 midterm elections. But officials also warned that cyber threats from foreign adversaries were evolving, accelerating and likely to reach a growing number of targets. NSA officials outlined a three-part approach they said was key to ensuring the security of the 2018 midterms: They first sought to understand adversaries’ activities, and then shared, chiefly through the FBI and Department of Homeland Security, information with potential targets. Along with U.S. Cyber Command, the military’s cyber defense arm, officials said they also imposed unspecified “costs” on those aiming to disrupt U.S. political processes. “[W]e said… if there is an adversary or adversaries that are attempting to either influence or interfere in our elections, we’re going to take them on,” General Paul Nakasone, who leads both the NSA and U.S. Cyber Command, said at the annual Intelligence and National Security Alliance (INSA) Summit last week.