The American-led bombing campaign is doing little to stem the tide of foreign fighters joining the war in Iraq and Syria. Four thousand of these fighters have joined the conflict since the allied airstrikes began, U.S. intelligence officials tell The Daily Beast.

That’s nearly as many combatants as coalition forces claimed to have killed, raising fears that if ISIS can continue to withstand a sustained air campaign, it could keep its ranks restocked for years, if not decades, to come.

“The numbers are not moving in our favor,” Senate Foreign Relations Committee Chairman Bob Corker (R-TN) told The Daily Beast last week, after emerging from a secret briefing at the Capitol with retired Marine Gen. John Allen, presidential envoy in the campaign against ISIS. […]