Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE’s presidential campaign is exhuming the Twitter archives of a top Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE aide in a new attack against the Democratic front-runner.

“If you ever want to work for a campaign that shares your values on health care, there’s always room at Bernie 2016,” Sanders (I-Vt.) tweeted, linking to a 2013 tweet from John Podesta.

Podesta tweeted in November 2013: “Just applied online for Medicare. Took 5 minutes. Single payer anyone?”

If you ever want to work for a campaign that shares your values on health care, there's always room at Bernie 2016. https://t.co/sFhjtVhepF — Bernie Sanders (@BernieSanders) January 11, 2016

Sanders has said he supports a single-payer, Medicare-for-all bill.

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The senator has introduced single-payer bills in previous sessions of Congress, and has argued that his proposal would be cost effective.

In a fundraising pitch, he has criticized Clinton for taking millions of dollars from the pharmaceutical industry for her presidential run.

As of late December, Clinton had raised about $1.1 million from the pharmaceuticals or health products industries this cycle, according to data from Open Secrets.