Now playing Next USA Mueller, Trump's silent foil, gets ready to talk Analysis: If the former special counsel's congressional testimony is damaging, the president will have to hope that his two-year delegitimization campaign worked. 23/07/2019
Now playing Next USA Mueller last-minute request for aide to appear as witness during his testimony Republicans charged that the move would plunge the hearing into 'chaos.' 23/07/2019
Now playing Next USA Robert Mueller testimony: Everything you need to know The former special counsel will testify publicly before two different congressional panels on Wednesday. 23/07/2019
Now playing Next USA Nadler says Mueller should ignore DOJ 'cover-up' efforts on testimony The congressman said on Tuesday that Mueller should ignore Justice Department attempts to restrict his testimony. 23/07/2019
Now playing Next USA Doctors find differences in brains of U.S. diplomats who alleged mystery attacks in Cuba Doctors found "significant differences" but couldn't say if they were caused by whatever happened in Cuba or if those differences were tied to symptoms. 23/07/2019
Now playing Next France 'Hold adults accountable,' says climate change activist Greta Thunberg "Young people should speak up and hold adults accountable in the combat against climate change," said activist Greta Thunberg on receipt of Normandy's first Freedom Prize. 23/07/2019
Now playing Next USA Apple's Intel play and Leo DiCaprio's enduring prestige Byers Market is a daily newsletter from NBC News senior media reporter Dylan Byers that takes you behind the scenes in Hollywood, Silicon Valley, New York and Washington. 23/07/2019
Now playing Next USA Question for Mueller: Why wasn't Trump Jr. interviewed? The president's son was the only American participant in the infamous Trump Tower meeting not to talk with investigators in the Russia probe. 23/07/2019
Now playing Next USA Democrats want Mueller to tell swing voters what Trump did wrong Analysis: Dems want to make more swing voters aware that the Mueller report, far from exonerating Trump, contains significant evidence of wrongdoing. 23/07/2019
Now playing Next World Greta Thunberg: ‘Don't listen to children, listen to scientists’ The 16-year old Swedish environmentalist Greta Thunberg urged French MPs to listen to scientists and act to reduce global warming. 23/07/2019
Now playing Next USA Mueller will make the full report his official statement to Congress committees The former special counsel is set to testify on Wednesday before House Judiciary and Intelligence panels. 22/07/2019
Now playing Next USA Trump says he might watch a 'little bit' of Mueller testimony President Trump had previously said he would not watch the former special counsel's public congressional testimony this week, scheduled for Wednesday. 22/07/2019
Now playing Next USA Your safari selfies are cute, but they're a road map for poachers In South Africa alone, around 1,200 rhinos were killed in 2017 — equivalent to approximately three per day. The poachers shoot the animal in the head, tear the horn from the skull, and leave the rhino to die. 22/07/2019
Now playing Next USA Washington's answer to big tech could be an office mothballed almost 25 years ago Democratic members of the House are renewing a push to reopen a government office dedicated to providing expertise and analysis on new technologies. 22/07/2019
Now playing Next Iran Iran says it uncovered CIA spy ring amid heightened tensions with US The Iranian Intelligence Ministry said at a press conference on Monday that it had identified and arrested 17 spies acting on behalf of the US Central Intelligence Agency (CIA). 22/07/2019
Now playing Next USA Here's what to expect from Robert Mueller on Wednesday First Read is your briefing from "Meet the Press" and the NBC Political Unit on the day's most important political stories and why they matter. 22/07/2019
Now playing Next USA 17 alleged U.S.-trained spies arrested by Iran The Iranian Intelligence Ministry held a briefing on Monday where they announced the alleged spies were Iranian citizens but trained by the CIA. 22/07/2019