Photo: Ahmad Al-Rubaye/AFP/Getty Images

More than 2 million Muslims have begun the annual Hajj pilgrimage to Mecca, Islam's holiest city, in Saudi Arabia, Al Jazeera reports.

Why it matters: Every able-bodied Muslim is required to take part in the five-day pilgrimage at least once in their life to visit the Kaaba, a cube-shaped building considered the holiest site in Islam, and perform a series of other holy rituals.

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Chief Justice John Roberts was hospitalized in June after fall

Chief Justice John Roberts overseeing the Senate impeachment trial of President Trump. Photo: Senate Television via Getty Images

Chief Justice John Roberts was hospitalized overnight after a fall on June 21, a Supreme Court spokesperson confirmed to the Washington Post on Tuesday.

Why it matters: Speculation regarding justices' health — given their lifetime appointments — always runs rampant, and this incident may have not been made public if the Post hadn't "received a tip."

Congress vs. tech's gang of four

Illustration: Sarah Grillo/Axios

The CEOs of tech's four leading giants will defend their industry's growing concentration of power from critics on both right and left who view them as monopolists when they testify, most likely virtually, before Congress on July 27.

Why it matters: The joint appearance by Facebook's Mark Zuckerberg, Apple's Tim Cook, Amazon's Jeff Bezos and Google's Sundar Pichai will mark a historic collision between the leaders of an industry that has changed the world and political leaders who believe those changes have harmed democracy and individual rights.

2020 attention tracker: The Trump policy trap

Data: Newswhip; Graphic: Axios Visuals — Note: Hover over the graphic on desktop to see weekly articles and interactions for candidates and issues.

The three topics generating the most intense interest online are the coronavirus, racial injustice and foreign policy, according to data from NewsWhip provided exclusively to Axios — and all are issues that are working against President Trump right now.

Why it matters: Storylines in Trump's populist sweet spot that carried the news cycle for much of his presidency — immigration, trade, a strong economy — have fallen away during the pandemic.