President Donald Trump is speaking out against what he describes as the “carnage” afflicting civilians in a rebel stronghold in Syria. He wrote in a tweet Thursday that “Russia, Syria and Iran are killing, or on their way to killing” thousands of civilians in Idlib province. That’s the last rebel-held bastion in Syria. The province has been subjected to an intense air and ground bombardment by government forces that has displaced many civilians toward the Turkish border. About a month ago, Syrian government forces launched a renewed effort to take the province.