Brian Katulis

Slowly but surely, Barack Obama is edging the United States deeper into a war against the Islamic State group that looks set to dominate the last year of his presidency.

National security will be the focus of Saturday's Democratic presidential debate in Iowa, with the front-runner, Hillary Clinton, expected to be pressed on how she would confront the threat from Islamic State and other terror groups.

Slowly but surely, Barack Obama is edging the United States deeper into a war against the Islamic State group that looks set to dominate the last year of his presidency.

National security will be the focus of Saturday's Democratic presidential debate in Iowa, with the front-runner, Hillary Clinton, expected to be pressed on how she would confront the threat from Islamic State and other terror groups.