A vine of Bernie Sanders giving Hillary Clinton the side eye went viral during the fourth Democratic debate.

His skeptical face was in response to Clinton reciting attacks he had previously leveled against President Obama. “Where we disagree is the comments that Senator Sanders has made that don’t just affect me, I can take that, but he’s criticized President Obama for taking donations from Wall Street, and President Obama has led our country out of the Great Recession,” the former Secretary of State said. “Senator Sanders called him weak, disappointing. He even, in 2011, publicly sought someone to run in a primary against President Obama.”

Clinton is referring to a radio show Sanders appeared on with Thom Hartmann in 2011, where Sanders said that “millions of Americans” were “deeply disappointed” in Obama and “cannot believe how weak he has been.” He then continued, “I think one of the reasons the president has been able to move so far to the right is that there is no primary opposition to him and I think it would do this country a good deal of service if people started thinking about candidates out there to begin contrasting what is a progressive agenda as opposed to what Obama is doing.”

Get our Politics Newsletter. The headlines out of Washington never seem to slow. Subscribe to The D.C. Brief to make sense of what matters most. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Tessa Berenson at tessa.berenson@time.com.