Sen. Chris Van HollenChristopher (Chris) Van HollenThe Hill's Morning Report - Dem dilemma on articles of impeachment Graham, Van Hollen warn Pompeo that 'patience' on Turkey sanctions 'has long expired' Overnight Energy: Protesters plan Black Friday climate strike | 'Father of EPA' dies | Democrats push EPA to abandon methane rollback MORE (D-Md.) swiped at President TrumpDonald John TrumpLawmakers prep ahead of impeachment hearing Democrats gear up for high-stakes Judiciary hearing Warren says she made almost M from legal work over past three decades 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 Spicer'A Warning' replaces Donald Trump Jr.'s 'Triggered' as No.1 book on NYT bestseller list Sarah Sanders defends Trump: He reads 'more than anybody I know' The Hill's Morning Report - Witness transcripts plow ground for public impeachment testimony 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