Sen. Chris Van HollenChristopher (Chris) Van HollenZombie Tax punishes farmers to fill DC coffers Democrats face new pressure to raise taxes Democrats reintroduce bill to create 'millionaires surtax' MORE (D-Md.) swiped at President TrumpDonald TrumpChinese apps could face subpoenas, bans under Biden executive order: report Kim says North Korea needs to be 'prepared' for 'confrontation' with US Ex-Colorado GOP chair accused of stealing more than 0K from pro-Trump PAC 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 SpicerDeSantis to hold Newsmax town hall Biden's poor TV ratings against Trump is exactly what this administration wants Overnight Health Care: CDC director calls on Michigan to 'close things down' amid surge in cases | Regeneron says antibody therapy prevents COVID-19 infections 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