Hillary Clinton's revival of her 2016 primary spat with Bernie Sanders has enraged Democrats wanting to focus on defeating President Trump in the fall.

Clinton, 72, in interviews conducted for a documentary about herself, refused to commit to endorsing the Vermont senator, 78, should he become the Democratic 2020 presidential nominee.

Tommy Vietor, a Pod Save America co-host and a former Obama administration National Security Council spokesman who worked on the 2008 Obama campaign that beat Clinton during her first run for the White House, condemned her comments as "inexcusable."

"If Bernie wins the nomination, we all need to work our asses off to help him win. If someone else is the nominee, we all do the same for them. Don't kick up this bullshit right before Iowa, especially after complaining about Bernie's lack of support in 2016," Vietor tweeted.

This is inexcusable. If Bernie wins the nomination, we all need to work our asses off to help him win. If someone else is the nominee, we all do the same for them. Don't kick up this bullshit right before Iowa, especially after complaining about Bernie's lack of support in 2016. https://t.co/VXKCixb4Ci — Tommy Vietor (@TVietor08) January 21, 2020

Vietor's sentiments were echoed by other Democrats, including Sanders-aligned strategist Peter Daou. He advised the former first lady, New York senator, and secretary of state during the 2008 and 2016 election cycles.

"This broadside against #Bernie is profoundly wrong. Especially since it echoes the erasure of his diverse coalition by pushing the 'bro' narrative," he wrote.

NO, HILLARY CLINTON, NO.



I have diligently avoided attacking @HillaryClinton as I embraced #NotMeUs.



But this broadside against #Bernie is profoundly wrong. Especially since it echoes the erasure of his diverse coalition by pushing the "bro" narrative.https://t.co/JUoDI5c9SZ — Peter Daou (@peterdaou) January 21, 2020



Economics Nobel laureate and liberal New York Times opinion writer Paul Krugman added it wasn't "OK" to encourage disunity.

Disliking Sanders is OK. Not committing to support him if he is the nominee isn't. If you are horrified by Trump, you should be ready to go all-out for ANY Democratic nominee. https://t.co/zRlPCRKHF3 — Paul Krugman (@paulkrugman) January 21, 2020

Clinton made the remarks in an interview with the Hollywood Reporter to promote the four-part Hulu documentary set for release in March after the Feb. 3 opening Iowa caucuses.

"He was in Congress for years. He had one senator support him. Nobody likes him, nobody wants to work with him, he got nothing done. He was a career politician. It's all just baloney, and I feel so bad that people got sucked into it,” she says in the series about the former House lawmaker and former mayor of Burlington, Vermont.

Those weren't the only harsh words she had for supporters of Sanders, dredging up allegations of sexism. Clinton's comments coincide with last week's drama involving Massachusetts Sen. Elizabeth Warren, 70, who accused Sanders of saying in a 2018 private conversation that he didn't believe a woman could clinch the presidency. He has denied her claims.

“It's not only him, it's the culture around him. It's his leadership team. It's his prominent supporters. It's his online Bernie Bros and their relentless attacks on lots of his competitors, particularly the women. And I really hope people are paying attention to that because it should be worrisome that he has permitted this culture — not only permitted, [he] seems to really be very much supporting it," she told the Hollywood Reporter.

Sanders, on Tuesday, dismissed the flap ahead of the start of Trump's impeachment trial in the Senate.

“Today we’re dealing with a monumental day in American history. We’re dealing with New Hampshire, we’re dealing with Iowa. It’s keeping me busy," he told reporters on Capitol Hill.