Fox News host Chris Wallace Christopher (Chris) WallaceTrump, Biden will not shake hands at first debate due to COVID-19 Will Chis Wallace's debate topics favor Biden over Trump? House to vote on resolution affirming peaceful transition of power MORE on Wednesday said President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's continued attacks against the media amounted to the most "direct, sustained assault on the freedom of the press" in U.S. history.

“He has done everything he can to undercut the media, to try and delegitimize us,” Wallace said at a Newseum event in Washington, D.C., honoring the museum’s legacy ahead of its shuttering at the end of the year.

“I think his purpose is clear: to raise doubts when we report critically about him and his administration that we can be trusted. Back in 2017, he tweeted something that said far more about him than it did about us: ‘The fake news media is not my enemy. It is the enemy of the American people.’"

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Wallace went on to note that Trump's sustained attacks have "done some damage," pointing to a Freedom Forum Institute poll that found that 29 percent of Americans say the First Amendment goes "too far."

"And 77 percent say 'fake news' is a serious threat to our democracy," Wallace added.

Wallace also invoked William McRaven, the retired Navy admiral who oversaw the U.S. operation that killed Osama bin Laden and who called Trump's anti-media sentiment the "greatest threat to democracy in my lifetime."

"I've got to say I was a little surprised by that. This is a guy who fought the Soviet Union. This is an admiral who fought Islamic terrorism," Wallace said. "But when I asked Bill about this, this was his response: 'Those threats brought us together. ... The president and I swore an oath to the Constitution. When the president says the media is the enemy of the people, to me that undermines the Constitution. So I do think it is a tremendous threat to our democracy.'"

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The comments served as a theme of Wallace’s address, which spanned the Fox News anchor’s career and the current state of political journalism. Wallace, the host of "Fox News Sunday," has gained a reputation as an aggressive questioner of guests across the political spectrum, including Trump administration officials like aide Stephen Miller Stephen MillerSpecial counsel investigating DeVos for potential Hatch Act violation: report Trump confirms another White House staffer tested positive for COVID-19 Biden pick creates furor, underscoring bitterness over Obama immigration policy MORE, acting chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE and former press secretary Sarah Huckabee Sarah Elizabeth SandersSarah Sanders on Trump's reported war dead criticism: 'Those comments didn't happen' Sarah Sanders memoir reportedly says Trump joked she should hook up with Kim Jong Un McEnany stamps her brand on White House press operation MORE Sanders.

Wallace has pushed Democrats equally, and he has hosted multiple town halls on the network featuring Democratic presidential candidates.

The broadcaster has been the frequent target of the president's ire in recent months over his coverage of the House impeachment inquiry. In November, the president ripped Wallace as "nasty" and "obnoxious" after he disputed comments House Minority Whip Steve Scalise Stephen (Steve) Joseph ScaliseGinsburg becomes the first woman to lie in state in the Capitol House GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections MORE (R-La.) made about the impeachment hearings.

Wallace addressed those comments for the first time Thursday, quipping that "afterwards, one of my sons said, 'Nasty? No. Obnoxious? Well.'"

Trump has repeatedly railed against members of the press during his time as president, often referring to them as the "enemy of the people" and "fake news." While many Fox News opinion hosts regularly praise the president, Trump has in recent months shown a willingness to go after the network's news anchors and its polling department.

Wallace warned that journalists shouldn't let Trump's "constant bashing of the media as a rationale, as an excuse to cross the line themselves." He also urged against reporters allowing their "animus" of the president to be plain to see in their reporting.