Bernie Sanders has called on his former Democratic primary opponent, Hillary Clinton, to move past the 2016 elections. The two, who have been among the most vocal critics of President Donald Trump, may have been driven further apart due to Clinton’s criticism of Sanders and the behavior of some of his supporters during the primaries.

Sanders proposes unity of progressives

Sanders appeared on “The Late Show with Stephen Colbert” as a guest on Thursday and answered some questions about the current developments in the Trump administration. He, however, took a surprising turn when asked by Colbert for advice on what to ask Clinton when she visits in two weeks.

Bernie Sanders said that the 2016 elections have long been over and that they should stop talking about it. He then urged Hillary Clinton to unite with other liberals and progressives to stop Trump’s divisive tactics. “We need her help to go forward,” he said. He tried convincing Colbert to ask her plans to help America push a progressive agenda.

Clinton’s book

The comments of Bernie Sanders about Hillary Clinton were made after some pages of her new book leaked on Twitter in the past few days. In Clinton’s new memoir, “What Happened,” the former Secretary of State talked about how Sanders’ criticism of her may have had some lasting effects on her campaign.

She also insisted that some of Sanders’ proposals may have been too ambitious and unrealistic, and should have been supported more by former president Obama during the primaries preceding the 2016 elections.

The New York Times reports that Hillary Clinton has also put some blame on her loss to former FBI director James Comey. Comey infamously released a letter ten days before the election day, informing Congress that he was reopening investigations into her private email server issue. She also blasted the New York Times for their negative coverage of her campaign, with her saying that she already expects the paper to publish a scathing review.

Even a week before the book is released in stores, the media buzz about “What Happened” has resulted in it shooting to the top of the Amazon best-selling books list, already making it one of the top selling titles of the year.

“The Late Show with Stephen Colbert” will be welcoming Hillary Clinton to its stage in less than two weeks. The show airs Mondays to Fridays at 11:35 pm ET on CBS. “What Happened” by Hillary Clinton will be in bookstores by Tuesday, September 12.