Last week, CNN published an explosive story related to the Trump-Russia case that raised important new questions about ties between Julian Assange, WikiLeaks, and Russia. The report said that CNN had obtained hundreds of pages of surveillance reports compiled for the Ecuadorian government by a Spanish security company, which showed that Assange, the founder of WikiLeaks, received “in-person deliveries, potentially of hacked materials related to the 2016 U.S. election, during a series of suspicious meetings” while he lived in the Ecuadorian embassy in London.

The Justice Department, after weeks of tense negotiations, has agreed to provide Congress with key evidence collected by Robert S. Mueller III that could shed light on possible obstruction of justice and abuse of power by President Trump, the House Judiciary Committee said on Monday.

Donald F. McGahn II, the former White House counsel, defied a House subpoena on Tuesday under order of the White House, stoking outraged Democrats to contemplate anew punitive measures, including opening an impeachment inquiry, to try to enforce Congress’s oversight powers.