Christopher Krebs, the current acting head of Homeland Security's cyber and infrastructure protection unit, met with acting Pennsylvania Secretary of State Robert Torres and other officials Tuesday morning. They discussed steps the state is taking to ensure its digital systems are secure on primary day and that officials are prepared to address any issues in the event something does not go as planned.

Pennsylvania was one of 21 states targeted by Russian hackers ahead of the 2016 presidential election, though Torres insisted Tuesday that hackers merely scanned for vulnerabilities and did not attempt to or successfully breach any state election systems.

The meeting underscores an ongoing effort by Homeland Security to build relationships with states and offer them assistance to secure their voting infrastructure ahead of the 2018 midterms. It took place as voters in Pennsylvania and three other states head to the polls to participate in their respective primaries.

"If I could put one message out there for the voters of Pennsylvania, I want to reinforce the fact that, at all levels of government, we take this seriously," Krebs said at a press conference following the meeting.