Islamic State fighters captured the last major military base in northeastern Syria on Sunday, bolstering its influence in the already unstable region. The U.S. kept up airstrikes against the group over the weekend, amid growing talk of an expanding ai campaign into Syria. Jeffrey Brown gets analysis on the threat from retired Army Col. Peter Mansoor and Stephen Walt of Harvard University.
Read the story here: http://www.pbs.org/newshour/bb/u-s-islamic-state/
Subscribe on YouTube: http://bit.ly/139JZdo
Watch more PBS NewsHour videos at: http://to.pbs.org/1e3qlFJ
Follow us on Twitter: https://twitter.com/newshour
Facebook: https://www.facebook.com/pbs.newshour
Google+: https://plus.google.com/+PBSNewsHour