Nine House Democrats who are also veterans of the military signed a letter released Monday that backs Rep. Nancy PelosiNancy PelosiJohnson eyes Irish border in Brexit negotiations Mueller report fades from political conversation Five key players in Trump's trade battles MORE (D-Calif.) as Speaker, arguing she has a proven record on national security and issues related to veterans.

The letter was spearheaded by Reps. Anthony BrownAnthony Gregory BrownAssault weapons ban picks up steam in Congress Here are the 95 Democrats who voted to support impeachment The Hill's Morning Report — Trump retreats on census citizenship question MORE (Md,), Ted LieuTed W. LieuCities are the future: We need to coordinate their international diplomacy George Conway opposes #unfollowTrump movement Puerto Rico resignations spur constitutional crisis MORE (Calif.) and Jimmy PanettaJames Varni PanettaOvernight Energy: Warren edges past Sanders in poll of climate-focused voters | Carbon tax shows new signs of life | Greens fuming at Trump plans for development at Bears Ears monument Carbon tax shows new signs of life in Congress Lawmakers introduce bill to block U.S. companies from doing business with Huawei MORE (Calif.), and comes as opponents of Pelosi also flex their muscle.

“When Democrats were last poised to be in the majority, then-Minority Leader Nancy Pelosi made national security and the commitment to our veterans her top priority in the ‘Six for ‘06’ agenda,” states the letter.

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“As we emerge into the 116th Congress, we need a Speaker who has a proven record of serving our veterans and advancing policies that enhance our national security interests. Nancy Pelosi has that record.”

The pressure from Democrats with a military background is important given the fact that a number of the lawmakers pressing for a new leader also have military or national security backgrounds.

They include Rep. Seth MoultonSeth Wilbur Moulton2020 Democrats react to NYPD firing of officer in Garner case: 'Finally' Biden, Buttigieg bypassing Democratic delegate meeting: report Native American advocates question 2020 Democrats' commitment MORE (Mass.), a former Marine Corp. officer who signed a letter released Monday that call for Democrats to back a new Speaker. Rep. Connor Lamb (Pa.) is another former Marine in Congress who has said he will not vote for Pelosi, while Rep.-elect Abigail Spanberger (Va.) is a former CIA officer.

Brown said it was important that Pelosi be elected to a second stint as Speaker because of her experience.

“I support Nancy Pelosi – I’m also a big supporter of Steny HoyerSteny Hamilton HoyerOmar says US should reconsider aid to Israel Liberal Democrat eyes aid cuts to Israel after Omar, Tlaib denied entry Lawmakers blast Trump as Israel bars door to Tlaib and Omar MORE for Majority Leader, my good friend Jim ClyburnJames (Jim) Enos ClyburnIsrael denies Omar and Tlaib entry after Trump tweet Democrats race across country to woo activists Warren introduces bill to cancel student loan debt for millions MORE for Majority Whip…we’ve got a lot of important, and will prove to be difficult work to do, so we need our very best, our most experienced,” he said during an appearance on MSNBC’s “Morning Joe” on Monday.