aid workers david haips. we look at -- david haips. we look at the group. >>> many american farmers say they are squeezed out of businesses. the many challenges they face coming up. >> tough realities... >> we chicago ch-iraq, because we have more killings... >> life changing moments... >> shut the camera.... >> from oscar winning director, alex gibney, a hard hitting look at the real issues facing american teens. the incredible journey continues... on the edge of eighteen only on all jazeera america >>> tonight we take a deeper look at the islamic state group, and the coalition president president barack obama is building to fight it. earlier, i.s. claims to have beheaded british aid worker david haines. he was kidnapped in idlib province, the latest development as president obama calls for a global coalition to fight i.s. tom ackerman has more. >> reporter: if there was an underlying vision in president obama's call for action against the islamic state, these words were the closest. >> it's the core principle of my presidency. if you