Sen. Bernie Sanders Bernard (Bernie) SandersPush to end U.S. support for Saudi war hits Senate setback Sanders: 'I fully expect' fair treatment by DNC in 2020 after 'not quite even handed' 2016 primary Sanders: 'Damn right' I'll make the large corporations pay 'fair share of taxes' MORE (I-Vt.) fired back at Hillary Clinton Hillary Diane Rodham ClintonSanders: 'I fully expect' fair treatment by DNC in 2020 after 'not quite even handed' 2016 primary Sanders: 'Damn right' I'll make the large corporations pay 'fair share of taxes' Former Sanders campaign spokesman: Clinton staff are 'biggest a--holes in American politics' MORE Friday afternoon in response to a subtle dig his Democratic presidential rival made during an NBC interview earlier in the day.

"I think you can come with your own ideas and you can wave your arms and give a speech,” Clinton told NBC's Andrea Mitchell, referring to both Sanders and Donald Trump Donald John TrumpHouse committee believes it has evidence Trump requested putting ally in charge of Cohen probe: report Vietnamese airline takes steps to open flights to US on sidelines of Trump-Kim summit Manafort's attorneys say he should get less than 10 years in prison MORE. "But are you connecting with and really hearing what people are either saying to you or wishing that you would say to them?”

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A Sanders spokesman responded with a subtle dig of his own, directing attention to the record-setting number of supporters who attend the Vermont senator’s rallies.

“Bernie is doing more than attracting large crowds,” the spokesman said. “He has a concrete set of proposals to take on the billionaire class and rebuild the disappearing middle class. That’s what people are responding to.”

Clinton has yet to mention Sanders by name in her speeches, but that may soon change as her closest rival continues to close in on her in the early-voting states of New Hampshire and Iowa.