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A former Olympian will not face trial after federal prosecutors acknowledged that the Trump administration’s claims of vandalism were false.

Federal prosecutors on Friday said that contractors hired by the Trump administration had botched the renovation of the Lincoln Memorial Reflecting Pool, leaving behind “widespread damage” in the pool’s new blue lining, and that the Interior Department had then falsely blamed that damage on vandals.

In an extraordinary motion filed Friday evening, the U.S. attorney in Washington, Jeanine Pirro, said she was seeking to dismiss a felony charge against David Hearn, a former Olympic canoeist who was accused of pulling up a piece of the pool’s lining two feet square.

In doing so, Ms. Pirro — a longtime ally of President Trump’s — directly contradicted the president’s repeated claim that the Reflecting Pool’s peeling liner was caused by people slashing its coating with knives. Instead, she said, “the damage was the result of a botched installation and not vandalism.”

Earlier this month, Ms. Pirro herself had echoed the president’s claims, calling a news conference to announce Mr. Hearn’s indictment on July 2. She said that she had “tremendous evidence” that Mr. Hearn had committed a felony, and noted that he faced up to 10 years in prison.

But on Friday, Ms. Pirro said that her prosecutors had been misled by the Interior Department, which had awarded a no-bid contract to a first-time government contractor to repair the iconic landmark.

Ms. Pirro said that the pool’s new blue coating had actually started to peel within two days of the project’s completion, and that the Interior Department kept that fact from prosecutors, telling them that “nearly all of the damage” was done by vandals.