Good morning. 🗣️ Top talker: The Trump administration has sued former national security adviser John Bolton to try to stop the publication of his memoir on June 23, saying it contains classified information that could compromise national security.

📚 Good news for Simon & Schuster: The book, "The Room Where It Happened," is once again #1 on Amazon's bestseller list.

Bonus: Per the Daily Beast, Trump may also seek legal action to block the forthcoming book by his niece Mary Trump, which promises to expose "harrowing and salacious" details about the president.

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Antitrust watch

'Big tech' CEOs are willing to testify. Tim Cook is TBD.

Moving the Market: Mark Zuckerberg, Sundar Pichai and Jeff Bezos have all signaled their willingness to testify before Congress this summer as part of an antitrust probe into big tech, setting the stage for a dramatic showdown between Washington lawmakers and the nation's most powerful business executives.

• The big picture: The House Judiciary antitrust subcommittee has been investigating whether Facebook, Alphabet, Amazon and Apple pose a threat to competition and harm consumers. The executives' testimony would be a landmark moment in that effort and the larger regulatory battle between Washington and Silicon Valley.

• Tim Cook is the only chief executive among tech's "big four" that has not signaled a willingness to testify. Meanwhile, Apple is facing antitrust scrutiny from European regulators, as well as criticism from companies that complain about its "App Store monopoly." (An Apple representative declined to comment).

The latest: Representatives for Facebook and Google sent letters to subcommittee chair Rep. David Cicilline, D-R.I., over the weekend signaling that Zuckerberg and Pichai would be willing to testify on the condition that the top executives at the other big firms did so as well.

• Those commitments come one day after a lawyer for Amazon said that Bezos would also be willing to testify. If he does, it would mark the first time he has done so before Congress.

• As for Cook, it's possible he wants to avoid seeing Apple associated with the other firms because he doesn't believe it deserves the same antitrust scrutiny. Apple's core business is the iPhone, which accounts for less than half of the national smartphone market.

What's next: Cicilline could subpoena Cook, forcing the Apple chief to either give in or face a legal battle. If Cook does agree to testify, there's no real excuse for Bezos, Zuckerberg and Pichai not to. If he doesn't, it may give all of them an opening to back out.

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🇺🇸 Election 2020

Mark Zuckerberg's 2020: More voters, ads optional

Big in the Bay, big in the Beltway: Mark Zuckerberg is launching a new Facebook initiative to register four million voters for the 2020 election, a landmark effort to improve the social media giant's impact on American politics even as it refuses to fact-check political ads.

• In an op-ed for USA Today, Zuckerberg also announced that Facebook will let users opt out of seeing political and social issue ads in their Facebook and Instagram feeds.

The big picture: Facebook has faced years of scrutiny for its role in the 2016 election. The voting registration campaign and the optional exposure to political ads gives Zuckerberg a way to play a more positive role in 2020, while still maintaining his laissez faire approach to political speech and political advertising.

• "I believe the best way to hold politicians accountable is through voting, and I believe we should trust voters to make judgments for themselves," Zuckerberg writes. "That's why I think we should maintain as open a platform as possible, accompanied by ambitious efforts to boost voter participation."

What's next: The new Facebook "Voting Information Center" will appear at the top of the Facebook News Feed and Instagram and will include information on voting and voter registration. It will be, as Zuckerberg says, "the largest voting information campaign in American history."

• "Overall," he says, "we expect more than 160 million people in the United States will see authoritative information on Facebook about how to vote in the general election from July through November."

Market Links

• Sundar Pichai bans ZeroHedge from Google Ads (NBC)

• Jeff Bezos may have a $500 billion media empire (CNBC)

• Bob Bakish talks up the CBS All Access reboot (THR)

• Linda Yaccarino brings back '30 Rock' (Variety)

• Jimmy Kimmel will host 'The Emmys' (USAT)

Christophe Archambault/Getty

Way out West

Reed Hastings' next project is a retreat for teachers

Talk of Tinseltown: Reed Hastings is building a 2,100-acre luxury ranch in the foothills of Colorado's Rocky Mountains that will serve as a foundation and training ground for American public school teachers, Recode's Teddy Schleifer reports.

• "The Retreat Land at Lone Rock will effectively function as the grounds for leadership retreats... for teachers, principals, and nonprofit heads. ... It will be open to both educators at traditional district public schools and those at charter schools."

The big picture: Hastings is "one of the country’s biggest donors to the education reform movement that’s trying to reshape America’s struggling school system." The foundation is "a passion project... that will expand the billionaire’s political influence."

• "Hastings, a private citizen, will now have the ability to choose a few leaders who agree with him and support them with his bank account and his center, giving him an outsized voice in one of America’s most fraught public policy debates."

What's next: More news from Hastings in the hours ahead! Keep your eyes on MSNBC.

⚾ What's next: Read NYMag's Will Leitch on baseball's "existential crisis," which is much bigger than the league's internal disputes over the start of the 2020 season.

See you tomorrow.