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WASHINGTON — President Trump is preparing to establish a panel to examine whether climate change affects national security, despite existing reports from his own government showing that global warming is a growing threat.

According to a White House memo dated Feb. 14, Mr. Trump’s staff members have drafted an executive order to create a 12-member committee, which will include a White House adviser, William Happer, whose views are sharply at odds with the established scientific consensus that carbon dioxide pollution is dangerous for the planet.

The memo casts doubt on multiple scientific and defense reports concluding that climate change poses a significant threat to national security, saying they “have not undergone a rigorous independent and adversarial peer review to examine the certainties and uncertainties of climate science, as well as implications for national security.”

The effort to establish the panel appears to be the latest step by the Trump administration to question the science of climate change, as Mr. Trump rolls back Obama-era regulations on planet-warming pollution from vehicle tailpipes and power plants. It also appears to be the latest example of Mr. Trump’s propensity to ignore the findings and recommendations of his own intelligence and defense officials.