Former Olympic canoeist David Hearn denies damaging US President Donald Trump’s Washington, DC reflecting pool renovation.

A former US Olympian has pleaded not guilty to vandalising the newly renovated Lincoln Memorial Reflecting Pool, in a case that has drawn national attention amid accusations that the administration of US President Donald Trump is trying to shift blame for a troubled renovation.

David “Davey” Hearn, a 67-year-old three-time Olympic canoe racer, entered his plea in federal court on Thursday after prosecutors accused him of “maliciously” damaging the “American flag blue” lining installed at the bottom of the reflecting pool at Trump’s request ahead of celebrations taking place at Washington’s National Mall for the 250th anniversary of the United States’ independence on July 4.

Federal prosecutors allege Hearn pulled at the liner on June 19, causing more than $1,000 in damage. He has been charged with destruction of government property, an offence that carries a maximum prison sentence of 10 years.

Hearn denied the allegations. He admitted he stopped at the pool during a bike ride, reached inside and touched a section of lining that was already peeling away, but that he did not remove or damage it. He told The Associated Press he let go when a park employee told him to stop.

Hearn’s lawyers argue the prosecution is an attempt by the Trump administration to deflect attention from what they describe as a botched renovation project.

“This indictment reflects the administration’s effort to shift blame for their own failures,” they said in a statement. “The justice system exists to determine facts, not to provide political cover.”

The 620-metre (2,030-foot) reflecting pool reopened in June after Trump ordered the new liner to be installed across the bottom. He said he was compelled to go ahead with the $14.7m renovation after a friend visiting from Germany called the pool dark and disgusting.

But within days, algae began to spread across the surface, the water turned chartreuse green, and sections of the liner began peeling away.

Experts have explained that the dark new coat of paint at the bottom of the pool would elevate the temperature and allow algae to grow, and that algae blooms in water are common at this time of year, especially in shallow, stagnant water like that of the pool.

Trump blamed the issues on vandals, claiming without evidence that “corrosive and destructive chemicals” were poured into the pool and that vandals “took some form of knife or blade” and put a long “gash into the beautiful facade”, although no one has been charged over those alleged acts.

The US president warned that anyone who allegedly damaged the pool could face long prison terms. “Please remember that there is a 10 year prison sentence for the destruction, or even the attempted destruction, of such things — Which will be fully enforced!” he wrote on Truth Social.

Last week, US Attorney for the District of Columbia Jeanine Pirro announced the indictment against Hearn, accusing him of intentionally damaging the liner.

The US Department of the Interior has said that at least six people were arrested on suspicion of vandalising the pool in the weeks after it reopened. National Guard troops and US Park Police were deployed to protect the site, which was fenced off during July 4 celebrations.

Thursday’s hearing drew a packed courtroom, with dozens of supporters waiting outside after Hearn entered his plea.

The reflecting pool’s problems have continued, with Trump acknowledging it will need to be drained again so the damaged liner can be repaired.