Former FBI Director James ComeyJames Brien ComeyThere was nothing remotely treasonous in Trump's performance with Putin Opinion: One FBI text message in Russia probe that should alarm every American Clapper: Intel officials showed Trump evidence of Putin's role in election meddling MORE on Sunday said the final days of the 2016 election, after he declared that the bureau had reopened its probe into Hillary ClintonHillary Diane Rodham ClintonWhite House protests extend into sixth day despite rain Clinton: US is 'losing friends and allies' under Trump Justice Dept releases surveillance applications for former Trump aide MORE's email sever, made him feel "totally alone" and like "everybody hated me."

"It was a very painful period. Again, my whole life has been dedicated to institutions that work not to have an involvement in an election. I walked around vaguely sick to my stomach, feeling beaten down," Comey said in an interview with ABC's George Stephanopoulos.

"I felt like I was totally alone, that everybody hated me," he continued. "And that there wasn't a way out because it really was the right thing to do."

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Comey publicly said months before the election that Clinton would not be prosecuted for her handling of classified information. However, he wrote a letter just days before Election Day stating the FBI had uncovered new emails.

Though Comey eventually said no new information was found in the emails, Clinton’s team blamed the letter for her sharp drop in the polls leading up to the election.

Comey’s interview coincided with the release of his book, “A Higher Loyalty: Truth, Lies, and Leadership,” which details his interactions with the president and the fallout from the 2016 presidential campaign.

In the days since the first excerpts of Comey’s book were released, President TrumpDonald John TrumpSchiff: Surveillance warrant docs show that Nunes memo 'misrepresented and distorted these applications' Chicago detention facility under investigation following allegations of abuse of migrant children Ex-Trump aide: Surveillance warrants are 'complete ignorance' and 'insanity' MORE has lashed out at the former FBI director, labeling him a “leaker and liar,” a “slimeball” and “worst FBI Director in history, by far!”

Trump fired Comey last May. His ouster from the FBI led to the appointment of special counsel Robert Mueller to lead the investigation into Russian meddling in the 2016 presidential campaign.