Photo: Win McNamee/Getty Images

Acting White House chief of staff Mick Mulvaney said in a court filing Tuesday that he will not file suit to block a subpoena from House impeachment investigators, and will instead refuse to cooperate at the direction of President Trump and the Justice Department.

The big picture: Mulvaney had previously sought to join a lawsuit brought by former deputy national security adviser Charles Kupperman, who has asked a judge to rule whether he should comply with a House subpoena or an order from the president.

  • House Democrats dropped the subpoena for Kupperman last week, arguing that even if Kupperman's lawsuit is dismissed, the decision would be delayed by a prolonged court process.
  • They have also indicated that they will not pursue litigation to enforce a subpoena for Kupperman's former boss, John Bolton, and will instead use his and other officials' refusal to cooperate as evidence of White House obstruction.

Go deeper: Official testifies Mulvaney coordinated plan to push Ukraine for Biden investigations

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Pelosi, Schumer demand postmaster general reverse USPS cuts ahead of election

Schumer and Pelosi. Photo: Alex Wong/Getty Images

House Speaker Nancy Pelosi (D-Calif.) and Senate Minority Leader Chuck Schumer sent a letter to Postmaster General Louis DeJoy on Thursday calling for the recent Trump appointee to reverse operational changes to the U.S. Postal Service that "threaten the timely delivery of mail" ahead of the 2020 election.

Why it matters: U.S. mail and election infrastructure are facing a test like no other this November, with a record-breaking number of mail-in ballots expected as Americans attempt to vote in the midst of a pandemic.

CRISPR co-discoverer on the gene editor's pandemic push

Photo illustration: Aïda Amer/Axios. Photos: Brian Ach/Getty Images for Wired and BSIP/UIG via Getty Images

The coronavirus pandemic is accelerating the development of CRISPR-based tests for detecting disease — and highlighting how gene-editing tools might one day fight pandemics, one of its discoverers, Jennifer Doudna, tells Axios.

Why it matters: Testing shortages and backlogs underscore a need for improved mass testing for COVID-19. Diagnostic tests based on CRISPR — which Doudna and colleagues identified in 2012, ushering in the "CRISPR revolution" in genome editing — are being developed for dengue, Zika and other diseases, but a global pandemic is a proving ground for these tools that hold promise for speed and lower costs.

Updated 1 hour ago - Politics & Policy

Coronavirus dashboard

Illustration: Eniola Odetunde/Axios

  1. Global: Total confirmed cases as of 5 p.m. ET: 18,912,947 — Total deaths: 710,318— Total recoveries — 11,403,473Map.
  2. U.S.: Total confirmed cases as of 5 p.m. ET: 4,867,916 — Total deaths: 159,841 — Total recoveries: 1,577,851 — Total tests: 58,920,975Map.
  3. Politics: Pelosi rips GOP over stimulus negotiations: "Perhaps you mistook them for somebody who gives a damn" — Ohio Gov. Mike DeWine tests positive.
  4. Public health: Majority of Americans say states reopened too quicklyFauci says task force will examine aerosolized spread.
  5. Business: The health care sector imploded in Q2More farmers are declaring bankruptcyJuly's jobs report could be an inflection point for the recovery.
  6. Sports: Where college football's biggest conferences stand on playing.