Biden went back to poking fun at himself before signing the executive order, recalling back to when he was caught on hot mic back in 2010 telling Obama the ACA was \"a big f****** deal.\"

\"And Barack, let me remind you -- it's a hot mic,” Biden said to laughter.

Previewing Tuesday's remarks, White House press secretary Jen Psaki said Monday that Obama and Biden would also have lunch at the White House Tuesday -- \"as they used to do on a weekly basis\" -- and added, \"They continue to talk regularly.\"

\"They are real friends, not just Washington friends, and so I'm sure they will talk about events in the world as well as their families and personal lives,\" Psaki said.

\"PHOTO:
Alexander Drago/Reuters, FILE
PHOTO: White House Press Secretary Jen Psaki holds a press briefing at the White House in Washington, D.C., March 18, 2022.
>

The visit from the popular former president comes as Biden struggles in the polls over his handling of 40-year-high inflation and soaring gas prices he's pinned to the ongoing war in Ukraine.

Psaki said it's \"exactly the right time to have the former president come here -- given this is one of the proudest accomplishments that they worked on together, they shared together.\"

\"And it is emblematic of their shared view and belief that government can work for people and it can work for the American people. And this is an example of building on a success from more than 10 years ago and making it better over time,\" she added.

\"They are real friends, not just Washington friends,\" press sec. Jen Psaki says of Pres. Biden and former Pres. Obama.

Obama will visit the White House tomorrow for the first time since leaving office to attend Affordable Care Act event. https://t.co/khoz4nWIQz pic.twitter.com/0qdRXqeI5z

— ABC News Politics (@ABCPolitics) April 4, 2022

Psaki also said to expect Obama to return to the White House again soon for his presidential portrait unveiling \"and perhaps other engagements here in the future,\" she said.

Since Biden took office, the administration helped to lower health care premiums for nine million Americans through the American Rescue Plan, Psaki noted Monday, \"the biggest expansion of affordable health care since the ACA.\"

\"We've made affordable health coverage more accessible during the pandemic through the opening of the special enrollment period, which enabled nearly three million Americans to have access to newly sign up for coverage under the ACA,\" she said. \"And President Biden has overseen the most successful open enrollment in history last year with the historic 14.5 million Americans signing up for ACA coverage and another million people signing up for the basic health care program.\"

Tuesday marked Biden and Obama's first joint appearance since attending the 20th anniversary of the Sept. 11 attacks last fall in New York and their first joint event in Washington since Biden's inauguration in January 2021.

\"PHOTO:
Drew Angerer/Getty Images, FILE
PHOTO: Former President Barack Obama and Democratic presidential nominee Joe Biden wave to the crowd at the end of a drive-in campaign rally at Northwestern High School, Oct. 31, 2020, in Flint, Michigan.
>

When the pair celebrated the ACA's passage 12 years ago last month, Biden was caught on hot mic applauding Obama at the White House for what he called \"a big f------ deal.\"

Paraphrasing the memorable moment, a senior administration official told reporters, on what Biden announced, \"to borrow a phrase, this rule is a -- is a big deal.\"

\"We think it's the most significant administrative action to improve implementation of the ACA that we've taken since the law was first implemented,\" the official added.

\"PHOTO:
Chip Somodevilla/Getty Images, FILE
PHOTO: President Barack Obama is embraced by Vice President Joe Biden before signing the Affordable Health Care for America Act during a ceremony in the East Room of the White House March 23, 2010 in Washington, DC.
>

The rule would begin to take effect beginning Jan. 1, 2023, and Americans will be able to sign up to get financial assistance during the next open enrollment period.

As of last year, about 31 million Americans had health care coverage through the ACA, according to the Department of Health and Human Services.

ABC's Karen Travers reports:

ABC News' Molly Nagle and Justin Gomez contributed to this report.

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