President Trump's lawyer Rudy Giuliani told Fox Business' Maria Bartiomo Monday that he couldn't assure her "100%" that Trump had not threatened to withhold military aid from Ukraine if the country did not launch an investigation into Joe Biden and his son.

The big picture: Giuliani is at the heart of the Ukraine controversy — which he says involved him asking Ukrainian officials to investigate "Ukrainian collusion" that he claims occurred during the 2016 presidential election — but he acknowledged over the weekend that his request involved Biden.

Watch the exchange:

The big picture, via Axios' Jacob Knutson: House Democrats are now investigating Giuliani's time in Ukraine and whether Trump pressured Ukraine's president to open an investigation into Biden.

  • Trump confirmed on Sunday that he discussed Biden with Ukrainian President Volodymyr Zelensky during a July phone call.

Go deeper: What you need to know about the Trump-Ukraine controversy

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Louisville officer: "Breonna Taylor would be alive" if we had served no-knock warrant

Breonna Taylor memorial in Louisville. Photo: Brandon Bell/Getty Images

Sgt. Jonathan Mattingly, the Louisville officer who led the botched police raid that caused the death of Breonna Taylor, said the No. 1 thing he wishes he had done differently is either served a "no-knock" warrant or given five to 10 seconds before entering the apartment: "Breonna Taylor would be alive, 100 percent."

Driving the news: Mattingly, who spoke to ABC News and Louisville's Courier Journal for his public interview, was shot in the leg in the initial moments of the March 13 raid. Mattingly did not face any charges after Kentucky Attorney General Daniel Cameron said he and another officer were "justified" in returning fire to protect themselves against Taylor's boyfriend.

U.S. vs. Google — the siege begins

Illustration: Sarah Grillo/Axios

The Justice Department fired the starter pistol on what's likely to be a years-long legal siege of Big Tech by the U.S. government when it filed a major antitrust suit Tuesday against Google.

The big picture: Once a generation, it seems, federal regulators decide to take on a dominant tech company. Two decades ago, Microsoft was the target; two decades before that, IBM.

Dion Rabouin, author of Markets
1 hour ago - Economy & Business

Why the stimulus delay isn't a crisis (yet)

Illustration: Aïda Amer/Axios

If the impasse between House Speaker Nancy Pelosi and the White House on a new stimulus deal is supposed to be a crisis, you wouldn't know it from the stock market, where prices continue to rise.

  • That's been in no small part because U.S. economic data has held up remarkably well in recent months thanks to the $2 trillion CARES Act and Americans' unusual ability to save during the crisis.