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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Robert Mueller speaks out on Roger Stone commutation

Former Special Counsel Robert Mueller testifies before the House Permanent Select Committee on Intelligence on Capitol Hill on Wednesday July 24, 2019. Photo: The Washington Post / Contributor

Former special counsel Robert Mueller responded to claims from President Trump and his allies that Roger Stone was a "victim" in the Justice Department's investigation into Russian interference in the 2016 election, writing in a Washington Post op-ed published Saturday: "He remains a convicted felon, and rightly so."

Why it matters: The rare public comments by Mueller come on the heels of President Trump's move to commute the sentence of his longtime associate, who was sentenced in February to 40 months in prison for crimes stemming from the Russia investigation. The controversial decision brought an abrupt end to the possibility of Stone spending time behind bars.

Trump dons face mask during Walter Reed visit

Trump wearing a face mask in Walter Reed National Military Medical Center on July 11. Photo: Alex Edelman/AFP via Getty Images

President Trump wore a face mask during his Saturday visit to Walter Reed National Military Medical Center, according to AP.

Why it matters: This is the first known occasion the president has appeared publicly with a facial covering as recommended by health officials since the coronavirus pandemic began, AP writes.

Updated 10 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 5:30 p.m. ET: 12,607,510 — Total deaths: 562,338 — Total recoveries — 6,948,863Map.
  2. U.S.: Total confirmed cases as of 5:30 p.m. ET: 3,228,884 — Total deaths: 134,600 — Total recoveries: 983,185 — Total tested: 38,919,421Map.
  3. Public health: Jimmy and Rosalynn Carter: "Please wear a mask to save lives" Fauci hasn't briefed Trump on the coronavirus pandemic in at least two months — We're losing the war on the coronavirus.
  4. Food: How the coronavirus pandemic boosted alternative meat.
  5. Sports: Charge of "money grab" by college football.
  6. World: India reimposes lockdowns as coronavirus cases soar.