Thirty-five people are dead and more than 300 are injured after an alleged ISIS attack at an airport and metro station in Brussels last week.
The attack reignited fears around the world about the threat of potential terror.
Presidential hopefuls in the United States spoke out against the attacks and also revealed their national security plans if elected in 2016.
MPR News host Kerri Miller spoke with two national security experts about the plans major party candidates have put forward:
• Daniel Wagner, CEO of Country Risk Solutions and author of the forthcoming book "Global Risk Agility"