The top ranking U.S. military official in charge of the campaign against ISIS this week rebuked Sen. Ted Cruz’s plan to “carpet bomb” the terrorist group, saying the idea is “inconsistent with our values.”

Cruz first came up with the idea back in December, telling a group in Iowa that his administration will “utterly destroy ISIS,” adding, “We will carpet-bomb them into oblivion. I don’t know if sand can glow in the dark, but we’re going to find out!” (Some interpreted Cruz as saying he wanted to use nuclear weapons against ISIS)

When asked about Cruz’s plan during a video conference with reporters this week, Lt. General Sean MacFarland replied: “We’re the Untied States of America and we have a set of guiding principles and those effect the way we as professional soldiers, airmen, sailors, Marines, conduct ourselves on the battlefield,” he said. “So indiscriminate bombing, where we don’t care if we’re killing innocents or combatants, is just inconsistent with our values. And it’s what the Russians have been accused of doing in parts of northwest Syria. Right now we have the moral high ground, and I think that’s where we need to stay.”