Sen. Chris Van HollenChristopher (Chris) Van HollenThe Hill's 12:30 Report: Manafort sentenced to total of 7.5 years in prison Hillicon Valley: Google takes heat at privacy hearing | 2020 Dems to debate 'monopoly power' | GOP rips net neutrality bill | Warren throws down gauntlet over big tech | New scrutiny for Trump over AT&T merger Trump faces new scrutiny over AT&T-Time Warner merger MORE (D-Md.) swiped at President TrumpDonald John TrumpTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Pentagon investigator probing whether acting chief boosted former employer Boeing Trump blasts McCain, bemoans not getting 'thank you' for funeral MORE on Saturday while attending the "March for Our Lives" rally in Washington, D.C., calling for action on gun violence.

Asked about estimated attendance at the rally, which was expected to draw hundreds of thousands of people, Van Hollen told The Hill, "I can tell you for sure, it's larger than the Trump inauguration."

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While exact turnout figures have yet to be released, organizers obtained a permit for 500,000 people to rally in D.C. around Pennsylvania Avenue near the White House. Hundreds of similar marches were planned worldwide.

Trump sparked backlash last year after sending then-White House spokesman Sean SpicerSean Michael SpicerThe five Trump communications directors who have come and gone New York state officials subpoena Trump Org's longtime insurance broker The Hill's 12:30 Report: Trump fires back at new Dem probe MORE to confront members of the media over coverage of his inauguration crowd size after taking office.

Spicer claimed the press misrepresented the number of people at the inauguration after numerous reports indicated that the crowd was much smaller than former President Obama’s 2009 inauguration crowd.

The White House spokesman claimed at the time that Trump's inauguration crowd size was “the largest audience to ever witness an inauguration, period, both in person and around the globe,” garnering pushback from the media.

Spicer said in September that he regretted his fiery exchange with reporters.

— Mike Lillis contributed