More than 150 Democratic lawmakers on Thursday launched a group aimed at protecting and expanding social security benefits.

The group of progressive Democrats, known as the Expand Social Security Caucus, is being led by Senate co-chairs Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) and House co-chairs John Larson John Barry LarsonAARP endorses Democrats' measure to overturn Trump payroll tax deferral GAO clears way for Democrats to try to overturn Trump's payroll tax deferral Trump payroll-tax deferral for federal workers sparks backlash MORE (D-Conn.), Debbie Dingell Deborah (Debbie) Ann DingellRaces heat up for House leadership posts Michigan Rep. Debbie Dingell easily wins House primary Court orders release of Black Michigan teen who was jailed for missing schoolwork MORE (D-Mich.) and Conor Lamb (D-Pa.), the group announced during a press conference Thursday morning.

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Sanders in a news release said the caucus was launched, in part, to disprove President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's recent claim that Democrats are trying to slash Social Security.

"At a campaign rally in Montana last week, President Trump claimed Democrats want to 'destroy your Social Security,' and 'I’m going to save your Social Security,'" wrote Sanders, a longtime advocate for expanding the social safety net. "Meanwhile, the budget that Trump himself proposed earlier this year would have cut Social Security by some $72 billion over a 10-year period."

"Well today, along with 17 of my Senate colleagues and more than 140 of my House colleagues, I am announcing the Expand Social Security Caucus to make sure seniors can retire with the dignity they deserve," Sanders said.

The caucus was organized with assistance from Social Security Works, an advocacy nonprofit seeking to unite lawmakers behind expanding Social Security, according to the organization's communications director, Linda Benesch.

"The goals of the caucus … [are] not to promote any one specific piece of legislation," Benesch told The Hill, noting there are multiple expansion bills Democrats have introduced in the House and Senate that could benefit from the caucus's support.

The caucus could kick into high gear if Democrats are able to retake the House in November's midterm elections. Larson, the top Democrat on the House Ways and Means Subcommittee on Social Security, will likely hold hearings on expanding Social Security and could bring an expansion bill to the House floor if Democrats eke out a victory in the general election.

Lawmakers emphasized their belief that Social Security is an insurance program rather than an "entitlement."

“NEWS FLASH, Social Security is not an entitlement it is the insurance you have paid for!” - @RepJohnLarson #ExpandSocialSecurity pic.twitter.com/8mx640uuPj — SocialSecurityWorks (@SSWorks) September 13, 2018

Multiple Democrats noted that two-thirds of seniors receiving Social Security depend on the program for their livelihood.

"Despite the success of Social Security, one out of every five senior citizens in our country is trying to make it on less than $13,5000 dollars per year," Sanders said during the conference. "That is a disgrace in the richest country in the world."

Warren said the caucus amounts to "wind in [Democrats'] sails" in the fight to preserve and expand the program.

"We are here to fight shoulder-to-shoulder for what is right because this truly is a measure of the kind of people we are and the kind of country we want to be," Warren said.

"We made a promise to people all during their working years — you contribute to Social Security, and when the time comes for you to retire, or if you become disabled, or if something happens to you and you leave a small child behind, we have built a way that all of us will work together and make sure that everyone has a basic protection in this country."