Sen. Bernie Sanders, I-Vt., who is running for president and has greatly influenced Democrats’ policy positions, said Tuesday that he does not support a bill introduced by House leaders to expand Obamacare.

“No, I support the ‘Medicare for all’ single-payer program,” Sanders said when MSNBC’s Chris Hayes asked him about the legislation that was introduced earlier that day. Asked a second time to clarify his stance and whether he supported incremental changes to the healthcare system, Sanders again replied that he did not support the bill.