A new report says the terrorist attack in Brussles could have been much worse, Trump clarifies tax position and getting a workout at church.

Devlin Barrett from the Wall Street Journal has a look at Europe's latest push in their fight against terror.

Matthew Dalton from the Wall Street Journal breaks down how investigators are gathering information on the terror network behind the Brussels and Paris attacks.

Defense One technology expert Patrick Turner on the how likely it is that ISIS can obtain a nuclear weapon.

Anna Palmer from POLITICO breaks down how security officials are prepping for the upcoming GOP convention.

Stephen Fidler from the Wall Street Journal explains why the latest terror attacks are aimed at inspiring new recruits.

Suicide bomber kills dozens celebrating Easter in Pakistan, more Americans confirmed dead in Brussels, and security officials brace for the GOP convention.

The Wall Street Journal's Matthew Dalton explains why these attacks highlight Belgian's failure to clear out extremist networks

How should we respond when it comes to attacks like Brussels? Security Expert Paul Viollis joins us with a look.

Julian Barnes from the Wall Street Journal breaks down why extremists were able to strike in Brussels even during a state of heightened security.

Craig Whitlock from the Washington Post discusses the apocalyptic mission fueling the Islamic State's recent terrorist attacks in Europe.