Washington (CNN) At the signing ceremony for a much awaited US-China trade deal, President Donald Trump announced plans for a fireworks display at Mount Rushmore on July 4, 2020.

With South Dakota Gov. Kristi Noem in the audience, Trump said arranging the fireworks at the state's landmark was easy. "I called up our people and within about 15 minutes we got it approved and you're going to have your first big fireworks display at Mt. Rushmore," Trump said Wednesday.

Dismissing concerns that the fireworks posed an environmental threat, Trump said, "what can burn? It's stone," adding that "nobody knew why, they just said environmental reasons."

Facts First: Trump is wrong to suggest there hasn't been a large fireworks display at Mount Rushmore before. There were July 4 fireworks at Mt. Rushmore for several years, but they were discontinued in 2009 over environmental concerns including increased risk of fires. Also, the decision to resume fireworks at the South Dakota landmark was not approved "in 15 minutes," as the National Park Service is still evaluating the proposal.

Previously, fireworks at The Mount Rushmore National Memorial were suspended due to a pine beetle infestation which made the Black Hills National Forest surrounding the monument more susceptible to wildfires . A 2016 report by the US Geological Survey also found that past fireworks displays likely contaminated groundwater within the memorial, though drinking water remained safe for consumption. Since then, "the forest has gained strength and advancements in pyrotechnics allow for a safe fireworks display," according to a May 2019 statement from Noem's Press Secretary.

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