Sen. Bernie Sanders (I-Vt.) appeared to throw some shade at 2016 presidential nominee Hillary Clinton on Friday when he told ABC News’ “The View” co-hosts that he’s not interested in receiving advice from her on how to run his 2020 presidential campaign.

Sanders vied against Clinton, of course, for the 2016 Democratic presidential nomination. Clinton won that nomination after a bitter and surprisingly close primary season. But the two reached an uneasy alliance when he formally endorsed her campaign against President Donald Trump in July 2016.

His endorsement angered many of his passionate supporters. Some accused the progressive Sanders of caving to the political Establishment he had long railed against during his campaign.

Even Trump noted that point.

He tweeted in July 2016, “I am somewhat surprised that Bernie Sanders was not true to himself and his supporters. They are not happy that he is selling out!”

And now the Democratic socialist senator from Vermont intends to vie once more for the Democratic presidential nomination to run against Trump in 2020. Although many widely viewed Sanders as a progressive outlier in 2016, with an unlikely shot at winning the presidency, his radical views now seem mainstream among Democrats and the other 2020 candidates.

One of his newest campaign hires, deputy national press secretary Belén Sisa, won’t even be able to vote for Sanders in 2020 because she is a self-admitted illegal immigrant. Sisa, a millennial left-wing activist, has said her parents brought her illegally to the U.S. from Argentina when she was six year old.

She told reporters she’s been permitted to stay in the U.S. under former President Barack Obama’s Deferred Action for Childhood Arrivals (DACA) program.

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But Sanders is part of a very crowded and diverse field of opponents — many of whom are decades younger than him.

Some 2020 contenders have already reached out to Clinton for her advice, including Sen. Elizabeth Warren (D-Mass.), Sen. Cory Booker (D-N.J.), and Sen. Amy Klobuchar (D-Minn.).

Former Vice President Joe Biden (D), who may announce a 2020 bid of his own, has also reportedly sought Clinton’s advice.

Related: Bernie Sanders’ New Staffer Can’t Vote for Him in 2020: She Claims She’s an Illegal Immigrant

But Sanders told “The View” on Friday he will not be seeking the 2016 Democratic nominee’s advice.

Conservative co-host Meghan McCain began by asking him, “What do you think Hillary did wrong to lose to someone like Trump?”

Sanders replied, “I’m not enthusiastic to go back to 2016.”

“But I think, in some ways, she didn’t reach out to working class people the way I think she should have,” he added. “There were states where she did not campaign as vigorously as she should have — in Wisconsin, Michigan, maybe some other states. But that was 2016.”

Yet McCain pressed him, demanding, “We’re hearing about a lot of Democratic candidates who are meeting with Hillary Clinton for advice, though, people like Amy Klobuchar … Do you think you’ll do the same?”

A visibly annoyed Sanders replied, “I suspect not.”

He noted that Clinton “has not called me.”

“But you’re not interested in any advice from her?” McCain asked further.

“I think not,” Sanders replied. “You know, I think every Democrat is going to come together. Let me say what I’ve said before. I hope to be the Democratic nominee and have the support of the whole Democratic Party behind me. If I am not and somebody else is, I will support that candidate.”

The “important” thing is that “Trump is defeated,” Sanders insisted. “But Hillary and I have, you know, fundamental differences and that’s what it is,” he added.

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