Former Democratic presidential candidate Hillary Clinton refused to endorse former Vice President Joe Biden in the contest for the 2020 Democratic presidential nomination, even though she spent the majority of a morning CNN interview deriding Sen. Bernie Sanders (I-VT) as weak against President Donald Trump.

Clinton is in the middle of a media blitz promoting the Hulu documentary, “Hillary,” which became available on the streaming network Friday. The limited-run series explores Hillary Clinton’s life, both before and after her ill-fated 2016 presidential campaign.

On Sunday, Clinton appeared on “Fareed Zakaria GPS,” where she echoed complaints about the Vermont socialist that she made in an interview for the documentary.

Sanders is not “our strongest nominee against Donald Trump,” Clinton told the host.

WATCH:

WATCH: Hillary Clinton refuses to endorse Joe Biden, after saying that Bernie Sanders isn't the "strongest nominee against Donald Trump." CNN's Fareed Zakaria quickly points out that there isn't anybody left in the Democrat's primary. pic.twitter.com/JgTXJVXTc9 — Francis Brennan (Text TRUMP to 88022) (@FrancisBrennan) March 8, 2020

She also cautioned Democrat officials who believe Sanders’ supporters will fall in line if Biden is declared the nominee at the party’s July convention.

“I hope so because his failure and the behavior of a lot of his top aides, and certainly many of his supporters — up to the convention, at the convention, and even up to Election Day was not helpful,“ she said, essentially blaming the “Bernie Bros” (and, it seems, the candidate himself) for kneecapping her 2016 presidential effort. “I had thought we would unify, that’s what we’d always done before and that’s what I expected. I certainly tried to do that when I ran against Barack Obama and worked very hard for him.”

Clinton clearly has tepid feelings on Biden, though.

“I think what Joe’s victories on Super Tuesday showed is that he is building the kind of coalition that I had basically,” Clinton said. “It’s a broad-based coalition. I finished, you know, most of the work I needed to do for the nomination on Super Tuesday, and then it kind of lingered on — and I think Joe is on track to doing exactly the same thing — putting together a coalition of voters who are energized.“

When Zakaria pointed out that there are no other viable candidates left in the race aside from Biden, Sanders, and Rep. Tulsi Gabbard (D-HI), whom Clinton has insinuated is working with Russian officials to upend the 2020 presidential elections as a way of ensuring President Donald Trump has a second term in office, Clinton still declined to endorse Biden.

“I’m not endorsing,” she said.

She will “support” whomever snags the nod, she said, though.

Before the South Carolina primary, the 2020 Democratic presidential nomination was largely up in the air, and many outlets, including the polling experts at FiveThirtyEight, were predicting that Democrats might have to suffer through a ‘brokered” convention, where a single nominee fails to win a majority of available delegates, throwing the convention to a second, free-for-all vote. At that point, the floor would be open to nominees who did not compete in the primarys, potentially leaving room for Clinton to rejoin the race — and Clinton has been very careful not to close the door on a third presidential run.

Now that the party has coalesced behind Biden, a “brokered” convention is less likely, leaving Clinton out in the cold.