Democratic presidential candidates Sen. Elizabeth Warren, Tom Steyer and Sen. Bernie Sanders during a heated exchange at the debate at Drake University in Des Moines. Photo: Robyn Beck/AFP via Getty Images

Sen. Elizabeth Warren appeared to reject Democratic presidential rival Sen. Bernie Sanders' handshake after the progressive pair clashed during Tuesday night's debate in Des Moines, Iowa.

Driving the news: The longtime friends were at loggerheads during the debate on the North American trade deal and whether Sanders said a woman could be elected president. Here's what else unfolded, in photos.

Former Vice President Joe Biden speaks as Sanders and former South Bend Mayor Pete Buttigieg listen. Photo: Scott Olson/Getty Images
Buttigieg and Sen. Amy Klobuchar during the debate. Photo: Scott Olson/Getty Images
Biden greets Sanders. Photo: Scott Olson/Getty Images
Buttigieg hugs his husband, Chasten Buttigieg. Photo: Scott Olson/Getty Image
Warren, Biden and Sanders were all smiles before the debate. Photo: Scott Olson/Getty Images
Steyer, Warren, Biden, Sanders, Buttigieg and Klobuchar line up before the debate. Photo: Spencer Platt/Getty Images
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Scoop: Lawmakers tee up hearing with academics ahead of antitrust report

Big Tech CEOs testify before the House Judiciary antitrust panel in June. Photo: Mandel Ngan/Pool/AFP via Getty Images.

Mostly academics will be testifying at Thursday's House Judiciary antitrust subcommittee hearing which will reveal where its year-long investigation into big tech and competition is going, a source familiar with the matter told Axios.

Why it matters: The hearing is the next step following testimony from Facebook's Mark Zuckerberg, Google's Sundar Pichai, Amazon's Jeff Bezos and Apple's Tim Cook before the committee in July. A showing of academics and think-tank types signals the lawmakers are still sorting out competition theories and possible legislative fixes to perceived antitrust abuses.

Biden releases 2019 tax returns ahead of debate

Photo: Alex Wong/Getty Images

Joe Biden's campaign released his 2019 tax returns on Tuesday, showing that he and his wife, Jill, paid nearly $300,000 in federal taxes last year.

Why it matters: The release, timed just hours before the first presidential debate, comes days after a bombshell New York Times report said that President Trump paid only $750 in federal taxes in 2016 and 2017. Biden's team is hoping to make the tax contrast a sticking point during their showdown.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 2:15 p.m. ET: 33,454,037 — Total deaths: 1,003,571 — Total recoveries: 23,204,219Map.
  2. U.S.: Total confirmed cases as of 2:15 p.m. ET: 7,165,067 — Total deaths: 205,476 — Total recoveries: 2,794,608 — Total tests: 102,342,416Map.
  3. Health: Americans won't take Trump's word on the vaccine, Axios-Ipsos poll finds.
  4. States: NYC's coronavirus positivity rate spikes to highest since June.
  5. Sports: Tennessee Titans close facility amid NFL's first coronavirus outbreak.
  6. World: U.K. beats previous record for new coronavirus cases.