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Sen. Claire McCaskill, D-Mo., criticized GOP presidential candidate Sen. Ted Cruz, R-Texas, for missing a hearing on Wednesday on the strategy against the Islamic State and tried to poke holes in his plan to find out "if sand can glow in the dark" with an aggressive bombing campaign.

"One of our colleagues who is not here today, which is interesting considering this would be a pretty important hearing if you were running for president, he has said, this is Sen. Cruz, has said we will utterly destroy ISIS, 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," McCaskill said during a Senate Armed Services Committee hearing.

McCaskill asked how many innocent women and children would be killed under Cruz's proposal. Defense Secretary Ash Carter said the Pentagon takes "some pains" to avoid collateral damage, but ultimately punted to Vice Joint Chiefs Chairman Gen. Paul Selva.

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