Former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE said Sunday he would contest the presidential primary nomination at the Democratic  convention if Sen. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.) is leading in delegates without securing a majority. 

“The rules have been set,” Biden said on CNN’s “State of the Union.” 

ADVERTISEMENTBiden questioned Sanders’ take that the candidate with a plurality of pledged delegates the convention should become the nominee. 

“I wonder where that view was when he was challenging Hillary when she went in with a commanding lead,” Biden added. “You don’t change the rules in the middle of the game.” 

Sanders is the only candidate in the field this year to insist that the candidate with the most pledged delegates should be the party nominee. He held the opposing view in 2016 when facing former Secretary of State Hillary ClintonHillary Diane Rodham ClintonWhite House accuses Biden of pushing ‘conspiracy theories’ with Trump election claim Biden courts younger voters — who have been a weakness Trayvon Martin’s mother Sybrina Fulton qualifies to run for county commissioner in Florida MORE. 

Biden’s commitment to challenge the nomination comes after he won his first primary in South Carolina on Saturday. 

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Biden is trailing Sanders in the number of pledged delegates as the candidates head into Super Tuesday, when the largest number of states will hold primaries and caucuses including Texas and California.