Sanders was responding to a video excerpt from Comey's exclusive interview with Stephanopoulos that will air tonight at 10 p.m. ET.
In the excerpt aired on "This Week," Stephanopoulos asks Comey whether his choice to reveal that he was reopening the investigation into Clinton’s emails days before the election may have been influenced by his belief that Clinton would become president.
Comey, then the FBI director, sent a letter to Congress announcing the reopening of the email probe on Oct. 28, 2016, 11 days before the Nov. 8 election.
"At some level, wasn't the decision to reveal influenced by your assumption that Hillary Clinton was going to win and your concern that she wins this comes out several weeks later and then that's taken by her opponents as a sign that she's an illegitimate president?" Stephanopoulos asked Comey in the interview.
Clinton has said she thinks Comey's announcement about the email probe so close to the election killed her chances of winning.
Sanders on "This Week" slammed Comey, saying he has been “inconsistent constantly.”
“He said that he opened the Hillary Clinton investigation on its merits," the White House press secretary said. "Now we're finding out certainly that it had something to do with the political landscape.”
Unbelievably, James Comey states that Polls, where Crooked Hillary was leading, were a factor in the handling (stupidly) of the Clinton Email probe. In other words, he was making decisions based on the fact that he thought she was going to win, and he wanted a job. Slimeball! — Donald J. Trump (@realDonaldTrump) April 15, 2018
The president also suggested that the former FBI head could go to jail for various actions.
The big questions in Comey’s badly reviewed book aren’t answered like, how come he gave up Classified Information (jail), why did he lie to Congress (jail), why did the DNC refuse to give Server to the FBI (why didn’t they TAKE it), why the phony memos, McCabe’s $700,000 & more? — Donald J. Trump (@realDonaldTrump) April 15, 2018
Comey's new book, “A Higher Loyalty: Truth Lies and Leadership,” will be released Tuesday.
In a press briefing Friday, Sanders was critical of ongoing press coverage of the book. She said the media should focus on important national issues, and she referred directly to the Stephanopoulos interview.
“Congress has asked Jim Comey to come and testify multiple times, of which he’s denied being able to do," Sanders said. "Yet he found time to sit down with George Stephanopoulos for five hours."