Trump's DHS nominee: Cybersecurity a top challenge for US

President Trump’s nominee to lead the Department of Homeland Security, Kirstjen Nielsen, testified Wednesday that cyberattacks are the greatest threat to U.S. national security, and would be the organization’s primary focus if she were confirmed to lead the department.

“Each aspect of the department’s mission is important and as has been mentioned, there are many,” Nielsen told the Senate Homeland Security Committee Wednesday morning. “I believe one of the most significant for our nation’s future is cybersecurity and the overall security and resilience of our nation’s critical infrastructure.”