Fox News reports President Trump slammed former President Barack Obama on Sunday for not crossing his stated "red line" with Syria, amid reports of a suspected chemical attack that left at least 40 dead near the capital, while also warning Russia and Iran there will be a "big price to pay" for backing the Assad regime.Trump made the comments on Twitter in the wake of the alleged attack in the town of Douma amid a resumed offensive by Syrian government forces."Many dead, including women and children, in mindless CHEMICAL attack in Syria. Area of atrocity is in lockdown and encircled by Syrian Army, making it completely inaccessible to outside world," Trump said. "President Putin, Russia and Iran are responsible for backing Animal Assad. Big price to pay. Open area immediately for medical help and verification. Another humanitarian disaster for no reason whatsoever. SICK!"