Nine House Democrats who are also veterans of the military signed a letter released Monday that backs Rep. Nancy PelosiNancy Patricia D'Alesandro PelosiThe Hill's 12:30 Report: Trump, Dems eye next stage in Mueller fight After Mueller, Democrats need to avoid the Javert trap More than a half-million web articles published on Russia, Trump, Mueller since investigation began: analysis 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 BrownOvernight Defense: Pentagon chief under investigation over Boeing ties | Trump uses visual aids to tout progress against ISIS | Pentagon, Amnesty International spar over civilian drone deaths House Dem vets press McConnell on emergency declaration Overnight Defense: Gillibrand offers bill to let transgender troops serve | Pentagon ready to protect US personnel in Venezuela | Dems revive fight with Trump over Saudis MORE (Md,), Ted LieuTed W. LieuBooker takes early lead in 2020 endorsements House Dem vets press McConnell on emergency declaration Watchdog organization calls for investigation into Kushner clearance MORE (Calif.) and Jimmy PanettaJames Varni PanettaLawmakers propose bill to end fed agency's deadly experiments on kittens Koch-backed group pushes for new limits on Trump's tariff authority Overnight Defense: US reportedly easing demands over North Korean nukes | Trump optimistic for deal | Dems rip plan to use military funds for wall | Pentagon urges India, Pakistan to calm tensions 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 MoultonJared Kushner's brother made last-minute donation to Beto O'Rourke Senate campaign The Hill's Morning Report - Boeing crisis a test for Trump administration We could have less than 5 years to save the North Atlantic right whale 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 HoyerIlhan Omar tells Muslim group to 'raise hell' over discrimination This week: Congress set for next stage of Mueller probe fight Hoyer defends Israel in veiled shot at Omar MORE for Majority Leader, my good friend Jim ClyburnJames (Jim) Enos ClyburnDemocrats hurting themselves with handling of Ilhan Omar controversy Biden speaking to Dems on Capitol Hill as 2020 speculation mounts: report Former FCC Dem to advise T-Mobile, Sprint on merger 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.