President Donald Trump has lashed out on Twitter. Now he is lashing out at Twitter.

In a tweet Thursday morning, Trump attacked his social network of choice: “Twitter ‘SHADOW BANNING’ prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once! Many complaints.”

“Shadow banning” refers to a practice that predates the birth of Twitter: hiding or downgrading a user’s posts instead of banning the user, so that most people in an online forum cannot see the posts.

The president was likely referring to a report by Vice News, which said Wednesday it found that some Republican lawmakers, the Republican National Committee chair and Donald Trump Jr.’s spokesman no longer appeared in Twitter’s auto-populated drop-down search box.

When reached Thursday, a Twitter spokesman said he would have no comment about the president’s tweet. But he did address the shadow-banning charges: “As we have said before, we do not ‘shadowban.’ We are aware that some accounts are not automatically populating in our search box, and shipping a change to address this. The profiles, Tweets and discussions about these accounts do appear when you search for them.”

Kayvon Beykpour, Twitter’s head of product, tweeted Wednesday that the disappearance of some of the Republicans from the drop-down menu in search was a side effect of the company’s push to improve discourse on Twitter by cracking down on trolls, an effort it outlined in May. It involves taking into account the user accounts’ behavioral signals, including how they interact with other Twitter users.

“To be clear, our behavioral ranking doesn’t make judgments based on political views or the substance of tweets,” he said. “We’re always working to improve our behavior-based ranking models — their breadth and accuracy will improve over time.”

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A check Thursday morning confirmed that the names mentioned in the Vice article are once again appearing automatically in Twitter’s search box, including that of RNC Chair Ronna McDaniel; Rep. Devin Nunes, R-California; Rep. Matt Gaetz, R-Florida; plus Trump Jr.’s spokesman, Andrew Surabian.

So that’s that, right? No, because it’s 2018. The president’s tweet and other Republican outrage over the report are just the latest complaints that Silicon Valley’s tech giants are biased against them — even though it has become increasingly clear that disinformation on the very platforms they complain about were a factor in Trump’s and the Republicans’ victories at the polls in 2016.

Gaetz, the Republican congressman, told the Hill he felt “victimized” by Twitter.

During two separate Congressional hearings in April about Facebook’s latest privacy scandal, which involved Cambridge Analytica — a data consulting firm founded by conservatives that was used to help conservatives during the 2016 election — several conservative lawmakers asked Facebook CEO Mark Zuckerberg about what they perceived to be anti-conservative bias on the social network.

Also, representatives from Twitter, Facebook and YouTube were summoned to appear at a hearing last week before the House Judiciary Committee on Capitol Hill. They had to explain their content-filtering policies, and denied again that they are biased against conservatives.

At that hearing, Nick Pickles, Twitter’s global lead for public policy strategy, testified, “Our success as a company depends on making Twitter a safe place for free expression and a place that serves healthy public conversation.”

The tech giants have sometimes had wildly divergent approaches to content filtering.

For example, in a discussion about false news on its platform, Facebook recently defended conspiracy theory-laden InfoWars’ right to free speech.

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Twitter removes QAnon claim retweeted by Trump: That’s not what the CDC said On the other hand, YouTube this week reportedly deleted four videos from the channel of Alex Jones — who runs the InfoWars website and is perhaps most famous for popularizing the conspiracy theory that the 2012 mass school shooting at Sandy Hook was a hoax — and issued a “strike” against him. The Verge reports that two of the videos contained hate speech against Muslims, one contained hate speech against transgender people, and one — titled “How to prevent liberalism” — showed a child being pushed to the ground by an adult.

“We have longstanding policies against child endangerment and hate speech,” a YouTube spokesperson said Thursday. “We apply our policies consistently according to the content in the videos, regardless of the speaker or the channel. We also have a clear three strikes policy and we terminate channels when they receive three strikes in three months.”

Also last week, Zuckerberg got flak for saying Facebook is OK with hosting Holocaust deniers on its platform.