Vermont Sen. Bernie SandersBernie SandersDemocrats ask if they have reason to worry about UK result Buttigieg releases list of campaign bundlers Reject National Defense Authorization Act, save Yemen instead MORE may have provided Hillary ClintonHillary Diane Rodham ClintonMore than 200,000 Wisconsin voters will be removed from the rolls Trump is threatening to boycott the debates — here's how to make sure he shows up Trey Gowdy returns to Fox News as contributor MORE with campaign advertisement fodder at Monday night’s Democratic presidential forum in Iowa, acknowledging that his healthcare plan will require raising taxes.

Sanders was pressed on the specifics of his Medicare For All healthcare plan, which he has said will require a tax hike but which he claims will save individuals money overall by eliminating private healthcare premiums.

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“We will raise taxes, yes we will,” Sanders declared, calling criticim of his plan “disingenuous.”

But Clinton allies were already taking to Twitter to hammer Sanders for the remarks.

The Clinton campaign has accused Sanders of seeking to dismantle ObamaCare to implement a single-payer system, warning that he risks giving away gains liberals have made under the Affordable Care Act.

Some have questioned that line of attack; the single-payer system is popular among liberal primary voters.