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Data: Axios research; Table: Andrew Witherspoon/Axios

As investigations into tech giants' possible anti-competitive behavior multiply, authorities are beginning to tussle over turf — adding a new potential for discord to the regulatory chess game.

Why it matters: These probes are legally complex and historically difficult to pull off. There's bipartisan support right now for checking Big Tech's power, but the companies have enormous resources and remain popular, and fighting among regulators can only hamper their work.

Driving the news: Federal Trade Commission Chairman Joe Simons has written a letter to the Justice Department's antitrust division complaining about the DOJ's behavior in handling disagreements over which agency has the authority to probe Facebook, The Wall Street Journal reports.

  • Sen. Mike Lee (R-Utah) intends to bring up the letter and address the issue at a Senate Judiciary antitrust subcommittee hearing Tuesday, his office confirmed to Axios.

Be smart: Both agencies have clashed over who has jurisdiction to investigate, particularly Facebook.

  • Earlier this year the two agencies agreed that they would divide up investigations into the companies, with the DOJ taking on Alphabet (the parent company of Google) and Apple, and the FTC looking into Facebook and Amazon.
  • Tensions apparently rose in July when the DOJ announced another sweeping investigation into Big Tech platforms for their dominance, a move which reportedly had the FTC concerned that the DOJ would be stepping on its turf to investigate Facebook.

The big picture: A growing list of media investigations are presenting evidence of tech platforms abusing their dominance to promote their own products and services.

  • On Monday, the Journal reported that Amazon has changed its search function to more prominently feature products that are more profitable for the company. Amazon denies the report, saying it features products customers want, "regardless of whether they are our own brands or products offered by our selling partners."
  • Last week, a New York Times investigation revealed that Apple-owned apps often top rivals in its own App Store.
  • Friday, the House Judiciary Committee sent Facebook, Google, Apple and Amazon lengthy document requests, including executives' private communications, for its own investigation into the companies' practices.

The bottom line: Multiple probes can help regulators cover the vast territory they have set out to explore. But any time and resources they spend fighting each other will only benefit the companies they are seeking to hold accountable.

Go deeper: The growing list of U.S. government inquiries into Big Tech

Editor's note: This story has been updated since publication.

Go deeper

2 mins ago - Technology

Facebook stock whipsaws amid ad targeting concerns

Photo Illustration by Igor Golovniov/SOPA Images/LightRocket via Getty Images

Facebook's stock showed volatility in after-hours trading Wednesday, despite adding users and beating on top and bottom lines.

Why it matters: Investors seem spooked by proposed changes to user data collection by Apple that would impact Facebook's ad business, in addition to perennial threats of new federal privacy regulations.

Fed chair says low interest rates aren't driving stock market prices

Jerome Powell. Photo: ANDREW CABALLERO-REYNOLDS / Getty Images

Federal Reserve chairman Jerome Powell told reporters on Wednesday that rock-bottom interest rates aren't playing a role in driving stock prices higher, while noting that vulnerabilities to the financial system are "moderate."

Why it matters: The statement comes amid unshakeable stock prices and a Reddit-fueled market frenzy — prompting widespread fears of a bubble and the role monetary policy has played in that.

2 hours ago - World

Biden freezes U.S. arms deals with Saudi Arabia and UAE

Trump struck several large arms deals with Mohammed bin Salman (L) and Saudi Arabia. Photo: Kevin Dietsch-Pool/Getty Images

The Biden administration has put on hold two big arms deals with Saudi Arabia and the United Arab Emirates which were approved in the final weeks of the Trump administration, a State Department official tells Axios.

Why it matters: The sales of F-35 jets and attack drones to the UAE and a large supply of munitions to Saudi Arabia will be paused pending a review. That signals a major policy shift from the Trump era, and may herald sharp tensions with both Gulf countries.