Democrats are boasting that several Republicans are expected to defy their leadership team.
When asked by ABC News moderator Linsey Davis to clarify if he had a health care plan, the former president said he had "concepts of a plan" to replace the ACA but provided no details.
The special enrollment period that allows the uninsured to pick Affordable Care Act policies ends Sunday.
How will the Biden Administration affect your personal finances?
Many observers see as a likely outcome that the court could simply "sever" the individual mandate from the law and leave the rest alone.
The president sketched out what aides called a "vision" for quality health care at affordable prices, with lower prescription drug costs, more consumer choice and greater transparency.