Story highlights Bernie Sanders campaign appears out of step with its candidate over when details of a health care plan will be released

How to pay for health care has been a key part of the Clinton critique of her primary opponent

Keene, New Hampshire (CNN) Bernie Sanders could break his pledge to release details on how he would pay for his health care plan before the Iowa caucuses, according to a top aide.

His campaign released details Wednesday of how Sanders will pay his $1 trillion dollar infrastructure plan and his $75-billion-a-year plan to make public college and universities tuition-free. But noticeably absent was his plan to pay for Medicare for all, a price tag that some estimates put at $15 trillion.

Jeff Weaver, Sanders' campaign manager, isn't saying when those numbers will be released.

"I don't have a date for that," he said earlier this week. "Not necessarily before the caucuses."

Weaver stood by his comments on Wednesday, stating that the campaign does not yet have a date for when to release the Medicare-for-all plan. He added that Sanders' health care plan would be paid for "progressively," similar to the way his previous Medicare-for-all proposals have been paid for.

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