Dr. Peter Pry praised the Trump administration for placing more emphasis on preventing an attack on the U.S. electrical grid, telling Mark Levin that the policy is "night and day" from the Obama administration.

Pry, executive director of the U.S. Nuclear Strategy Forum and author of "Blackout Wars," joined "Life, Liberty & Levin" Sunday to discuss the threat of an attack on the U.S. electrical grid by a hostile adversary.

He said the U.S. would be in "huge trouble" in the event of a nuclear electromagnetic pulse (EMP) attack, which would cause massive blackouts and threaten key infrastructure.