A bipartisan group of more than 100 House lawmakers are urging President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE to name climate change a major security threat after he declined to include it in the administration’s national security strategy.

In a letter sent to the White House Thursday, 106 members, including 11 Republicans, implore Trump to “reconsider this omission.”

“We have heard from scientists, military leaders, and civil personnel who believe that climate change is indeed a direct threat to America’s national security and to the stability of the world at large,” write Reps. Jim Langevin James (Jim) R. LangevinPandemic underscores demand for career and technical education Rep. Jim Langevin fends off Democratic primary challenge in RI DHS cyber agency issues order boosting cybersecurity vulnerability reporting MORE (D-R.I.) and Elise Stefanik Elise Marie StefanikRepublicans cast Trump as best choice for women The Hill's Morning Report - Presented by Facebook - Pence rips Biden as radical risk GOP women offer personal testimonials on Trump MORE (R-N.Y.), who co-authored the letter.

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“As global temperatures become more volatile, sea levels rise, and landscapes change, our military installations and our communities are increasingly at risk of devastation. It is imperative that the United States address this growing geopolitical threat.”

The letter goes on to quote Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, who said in his confirmation hearing that “the effects of a changing climate ... will impact our security situation.”

Lawmakers even included such warnings in the fiscal 2018 National Defense Authorization Act, calling climate change “a direct threat to the national security of the United States.” Trump signed the NDAA into law in December.

Leaving out climate change breaks with the Obama administration, which last year said it considers climate change a national security threat.

“Failing to recognize this threat in your National Security Strategy represents a significant step backwards on this issue and discredits those who deal in scientific fact,” the letter states.

Langevin in July offered an amendment to the NDAA that would require the Pentagon to conduct a study on the impact of climate change on U.S. military installations and to report to Congress the installations most vulnerable to a changing climate.

The language made it in to the final bill, and requires Mattis to submit to Congress “a report on the vulnerability to military installations and combatant commander requirements resulting from climate change over the next 20 years.”

But Deputy Defense Secretary Patrick Shanahan said last month that the National Defense Strategy, which marks the direction and priorities for the Pentagon, will not mention climate change.

“We don't specifically address climate change. ... There is only so much, you know, depth and breadth. ... It really reflects the high priorities of the department,” Shanahan told reporters at the Pentagon.