President Trump at a Sept. 9 MAGA rally in Fayetteville, North Carolina. Photo: Jabin Botsford/The Washington Post via Getty Images

A Republican PAC that supports President Trump's re-election campaign plans to use location data from voters' smartphones "to find people who may not be registered to vote" in about 6 swing states before 2020, the Wall Street Journal reports.

The big picture: This technique — called "geofencing" — was used by 2020 Democratic candidate Beto O'Rourke during his 2018 Senate race, WSJ reports, and by CatholicVote, a conservative political advocacy group.

What's happening: The Committee to Defend the President "hired a company to collect unique identification numbers" from MAGA rally attendees' smartphones in North Carolina last month, per the WSJ —to create targeted ads that would drive people to the polls.

Between the lines, via the WSJ: "Political campaigns have long compiled exhaustive lists of all registered voters from state offices or other groups. They later supplemented that with demographic and purchasing information from data brokers in an approach called 'microtargeting' that has been used for years. Now detailed information gathered from smartphones is adding a new dimension to those techniques."

Go deeper: Political Campaigns Know Where You’ve Been. They’re Tracking Your Phone.

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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.

NYC's coronavirus positivity rate spikes to highest since June

New York Mayor Bill de Blasio. Photo: Noam Galai/Getty Images

New York City's coronavirus positivity rate has ticked up to 3.25%, its highest since June, Mayor Bill de Blasio said at a news conference on Tuesday.

Why it matters: The jump — from 1.93% on Monday — came on the first day that public elementary classrooms reopened in the city after months of closures, but guidelines state that all public schools will have to shut if the citywide seven-day positivity rate stays above 3%.