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Transportation Secretary Sean Duffy said Sunday that the collapse of Spirit Airlines followed former President Joe Biden's administration’s decision, alongside former Transportation Secretary Pete Buttigieg and the U.S. Department of Justice, to block a proposed merger with JetBlue, after the airline ceased operations early Saturday morning and entered liquidation.

"The Joe Biden-Pete Buttigieg administration and DOJ tanked that deal," Duffy said on ABC’s "This Week." "Immediately after that, they filed for bankruptcy."

Duffy’s remarks came as Spirit halted all flights at approximately 3 a.m.…