Democratic presidential candidates former Vice President Joe Biden, left, and Sen. Bernie Sanders, I-Vt., speak during a Democratic presidential primary debate Thursday, Dec. 19, 2019, in Los Angeles. (AP Photo/Chris Carlson)

After clashing over the $20 trillion (or as former Vice President Joe Biden said, as much as $40 trillion) Medicare for All plan, now experienced Washington, D.C. politicians Biden and Bernie Sanders of Vermont are battling over Social Security.

Tuesday night, Biden tweeted: “I’ve been fighting to protect — and expand — Social Security for my whole career. Any suggestion otherwise is just flat-out wrong.”

I've been fighting to protect — and expand — Social Security for my whole career. Any suggestion otherwise is just flat-out wrong. pic.twitter.com/KWIIJgFqGk

— Joe Biden (@JoeBiden) January 22, 2020

About 2 hours later, Bernie Sanders tweeted: “Let’s be honest, Joe. One of us fought for decades to cut Social Security, and one of us didn’t. But don’t take it from me. Take it from you.”

Let’s be honest, Joe. One of us fought for decades to cut Social Security, and one of us didn’t. But don’t take it from me. Take it from you. pic.twitter.com/qh7qb1Hmcl

— Bernie Sanders (@BernieSanders) January 22, 2020