Nine House Democrats who are also veterans of the military signed a letter released Monday that backs Rep. Nancy PelosiNancy Patricia D'Alesandro PelosiBudowsky: Pelosi can break shutdown stalemate GOP seeks to change narrative in shutdown fight Poll shows 25 percent view McConnell favorably, lowest among leaders in survey 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 BrownDem lawmaker: ‘Entirely inappropriate’ for Trump to talk politics during troop visit Overnight Defense: Almost half of border deployment sent home | Trump, Dems dig in as shutdown nears | Flynn associates charged over illegal lobbying Democrats with military background offer support for Pelosi MORE (Md,), Ted LieuTed W. LieuDems revive impeachment talk after latest Cohen bombshell Ivanka Trump to help pick new World Bank president, but will not be one of the candidates Lieu donates contributions from Ed Buck after second man found dead in Dem donor's home MORE (Calif.) and Jimmy PanettaJames Varni PanettaHouse passes bill expressing support for NATO This week: Congress heading in opposite directions on shutdown plans Ten Dem lawmakers added to House Ways and Means Committee 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 MoultonHouse passes bill expressing support for NATO The Hill's Morning Report — Shutdown fallout — economic distress How Pelosi is punishing some critics while rewarding others 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 HoyerHouse passes bill expressing support for NATO House Dems send McConnell shutdown stories, press for spending bill vote This week: Congress heading in opposite directions on shutdown plans MORE for Majority Leader, my good friend Jim ClyburnJames (Jim) Enos ClyburnClyburn: Dems did not rush to judgment over BuzzFeed report Black Caucus chair says America's growing diversity faces 'dragon' of hate House elects Pelosi to second Speakership 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.