Duffy details latest on investigation into what prompted nationwide ground stop

Fox News correspondent Alex Hogan reports the latest on the nationwide ground stop. Transportation Secretary Sean Duffy also joins 'Fox News Sunday' to discuss the latest on the investigation amid massive flight disruptions.

Fox News correspondent Alex Hogan reports from the White House on the travel chaos resulting from a massive nationwide ground stop. Transportation Secretary Sean Duffy also joins 'Fox News Sunday' to detail the latest on the investigation as he asks Congress for additional funding to modernize the agency's telecommunications network.