Judy Woodruff:

The investigation was eventually taken over by special counsel Robert Mueller, who was appointed eight days after Comey was fired.

Over the summer of 2017, President Trump repeatedly accused McCabe of a conflict of interest. McCabe's wife, Jill, had run unsuccessfully two years earlier for a Virginia state Senate seat, and had received donations from a Hillary Clinton ally.

McCabe himself had overseen the investigation into former Secretary Clinton's use of a private e-mail server, but not while his wife was running for office. Then, in March 2018, just days before his retirement, McCabe was fired for allegedly lying to federal investigators about improper media disclosures unrelated to the Russia probe.

McCabe contends he did nothing wrong and that his firing was retaliation for the investigation into the president.

And Andrew McCabe joins us now.

Welcome to the "NewsHour."