Donald Trump

CNN analyst Peter Bergen reflects on Trump's soured relationships with Generals Mattis, McMaster and Kelly. "He's gotten rid of the most competent people he had in his circle," Bergen says.

Time correspondent Simon Shuster recently spoke with Ukraine's president. After six months in office, Shuster says Volodymyr Zelensky is "quite cynical" and feels "there are no reliable allies."

During the '16 campaign, Glenn Simpson and Peter Fritsch hired former British intelligence agent Christopher Steele to investigate Trump's involvement with Russia. Their new book is Crime in Progress.

The Trump administration's pressure on Ukraine is the center of the impeachment inquiry, but foreign influence expert Ben Freeman says the influence also worked in the opposite direction.

New Yorker staff writer Andrew Marantz spent years with far-right online extremists, embedding with them and watching them spread false news by exploiting social media. His new book is Antisocial.

New York Times Magazine writer Emily Bazelon talks about impeachment and the Constitution: "The kind of polarization that we have right now is something that the founders really didn't grapple with."

New York Times reporter Andrew Kramer says impeachment puts Volodymyr Zelensky in a tough spot: "He may be dealing with a President Biden next year, or he may be dealing with President Trump."

Ronan Farrow's 2017 exposé of the sexual misconduct allegations against film producer Harvey Weinstein in The New Yorker earned him a Pulitzer Prize and helped usher in the #MeToo movement. Now, in his new book, Catch and Kill, Farrow writes about the extreme tactics Weinstein allegedly took in an attempt to keep him from reporting the story.

Bloomberg Businessweek columnist Joshua Green says Trump fell for a media campaign on Ukraine designed to help him: "The irony is that the target was supposed to be the Bidens, not the president."

Christopher Wylie was a research director at Cambridge Analytica. When he joined the company its goal was countering extremists who were using social media to recruit followers. But then the company began collecting personal data from Facebook users, and used it to target people susceptible to conspiracy theories and disinformation during the 2016 presidential campaign. Wylie left the company and became a whistleblower.