CNN host Bill Weir wrote Thursday in a since-deleted tweet that the U.S. military's decision to drop the “mother of all bombs” on an ISIS tunnel complex in Afghanistan was a sign of “desperation” by the Trump administration in its fight against the terrorist network.

“Uncomfortable football-as-war metaphor: The size of the bomb is directly proportional to a team’s desperation and rarely impacts the score,” Weir wrote on Thursday.

Weir, a former co-anchor of ABC's “Nightline” before coming to CNN in 2013, was referring to the bomb blast being explained in the size of three football fields.

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Weir apologized for the original tweet after blowback on social media for calling the bomb's use against ISIS an act of desperation.

Was thinking of conventional bombs (not atom/nukes) when I dashed off this dumb tweet and am now getting justly hammered. https://t.co/ubfBaVrIpI — Bill Weir (@BillWeirCNN) April 13, 2017

The GBU-43/B Massive Ordinance Air Blast is nicknamed the "Mother of All Bombs" because of its size and power. It is the largest non-nuclear bomb in the U.S. arsenal and the biggest bomb the U.S. has ever dropped in Afghanistan. It was unveiled by the Pentagon in 2003 for possible use in the Iraq War but was never used, as Weir noted in a previous tweet.

The US developed the "mother of all bombs" years ago but never saw a good use for it...until now https://t.co/X35e5kuoGN — Bill Weir (@BillWeirCNN) April 13, 2017

The Afghan Ministry of Defense said Friday that 36 ISIS fighters and no civilians were killed by the massive bomb.

Afghan officials said the blast destroyed multiple ISIS ammunition caches.

Weir is the host of CNN's "Wonder List," now in its third season.