Sen. Bernie SandersBernard (Bernie) SandersSanders, Warren, O’Rourke inspire patriotic small donor waves Bill Press reflects on Clinton, Sanders and a life in politics Overnight Health Care: GOP pushes stiff work requirements for food stamps | Johnny Isakson opens up about family's tragic loss to opioids | Republicans refuse to back vulnerable Dem's opioids bill | Dems offer new public option plan MORE (I-Vt.) on Saturday was quick to hit back at President Trump for tweeting that a rally of his voters would be bigger than any of the anti-Trump protests around the country.

"Maybe the millions of people who voted to MAKE AMERICA GREAT AGAIN should have their own rally. It would be the biggest of them all!” Trump tweeted early Saturday.

"They did. It wasn't," Sanders tweeted alongside a photo of Trump's inauguration last month, next to a photo of former President Obama's 2009 inauguration, which drew a larger crowd.

Trump criticized the media for covering the crowd size at his inauguration, insisting that his crowd was bigger than Obama's 2009 crowd despite evidence to the contrary.

"We had a massive field of people, you saw that. Packed," Trump said during remarks at CIA headquarters last month.

"I get up this morning and I turn on one of the networks and they show an empty field. I said wait a minute, I made a speech, I looked out, the field was, it looked like a million, a million and a half people. They showed a field where there were practically nobody standing there," he added.

The day after Trump’s inauguration, White House press secretary Sean Spicer insisted his swearing-in was “the largest audience to witness an inauguration, period. Both in person and around the globe.” He claimed that the numerous photos showing Obama’s inauguration was larger were “intentionally framed … to minimize the enormous support.”