Presidential candidate Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) fired back Wednesday after Sen. Mitt Romney Willard (Mitt) Mitt RomneyTrump 'no longer angry' at Romney because of Supreme Court stance GOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' MORE (R-Utah) called him “all hat, no cattle” on Twitter.

“I'm angry because multi-millionaires like you and Trump have rigged our economy at the middle class' expense. I'm angry because millions are living paycheck to paycheck. I'm angry because 34 million Americans are uninsured. Why doesn't that anger you?” Sanders tweeted.

I'm angry because multi-millionaires like you and Trump have rigged our economy at the middle class' expense.



I'm angry because millions are living paycheck to paycheck.



I'm angry because 34 million Americans are uninsured.



Why doesn't that anger you? https://t.co/bhpn8Kgb9T — Bernie Sanders (@BernieSanders) July 31, 2019

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In the original tweet, Romney tweeted “Asked why @BernieSanders is so angry, the answer is simple: 28 years in Congress and never able to pass even a scintilla of his socialist agenda. All hat, no cattle.”

Romney later replied to Sanders's post, saying "socialism isn't the answer."

"If it was, maybe Bernie would have something to show for his 3 decades in Congress," he tweeted.

Nice try, but socialism isn’t the answer. If it was, maybe Bernie would have something to show for his 3 decades in Congress. #AllHatNoCattle https://t.co/nvInZ17oEX — Mitt Romney (@MittRomney) July 31, 2019

Sanders, a self-identified democratic socialist, has made platforms such as universal health care and free college central to his presidential run.

The Vermont senator and his fellow presidential candidate, Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.), both defended proposals to expand the social safety net against their centrist counterparts in their second Democratic debate Tuesday night.

Updated at 2:42 p.m.