Cedric Bixler-Zavala, the lead singer of The Mars Volta and previously a drummer for former Rep. Beto O’Rourke’s old band, Foss, took aim at the Texas Democrat after he backed former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE's White House bid earlier this week.

Shortly after O’Rourke, who ended his presidential campaign in November, announced he would be supporting Biden in the primary race, Bixler-Zavala took to Instagram to voice his support for Sanders.

In the post captioned, “No thank you Biden,” Bixler-Zavala also included a photo of Sanders smiling with the words: “Team Bernie all the f---ing way!!”

ADVERTISEMENT

View this post on Instagram No thank you Biden. A post shared by DESTROYER OF CULTS (@cedric_bixler_zavala_) on Mar 2, 2020 at 9:32pm PST

He also sounded off on his former bandmate’s decision to back Biden in a series of comments on the post that were captured by Vice.

“Beto really bummed me out bad by supporting Biden,” one commenter wrote, to which Bixler-Zavala responded: “Me too.”

When asked by another Instagram user whether he denounces his former bandmate for his endorsement of Biden, Bixler-Zavala wrote, “Denounced in the comatorium,” which is a play on the debut album released by Mars Volta in 2003, “De-Loused in the Comatorium.”

ADVERTISEMENT

“Maybe you could have a word with Beto,” one Instagram user also suggested in the comments.

“What, you think I can offer something the dnc [Democratic National Committee] hasn’t?” Bixler-Zavala responded.

O'Rourke joined fellow former White House contenders Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE in endorsing Biden on Monday, just days after the former vice president won the South Carolina primary.

"Tomorrow, March 3, 2020, I will be casting my ballot for Joe Biden," he said during his announcement. "We need somebody who can beat Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE. The man in the White House today poses an existential threat to this country, to our democracy, to free and fair elections. And we need somebody who can beat him. And in Joe Biden we have someone who is the antithesis of Donald Trump."