The infiltration by foreign countries like China into election voting equipment is emerging as a growing concern among vendors, who are actually asking for more federal regulation as they grapple with a lack of domestic suppliers producing critical technologies .

Top executives of the three largest voting machine vendors—Hart InterCivic, Dominion Voting Systems and Election Systems & Software—told the House Administration Committee Thursday they are hoping for guidance and support from the Department of Homeland Security on how to secure their subcontractors.