Barack Obama wades back into politics with bold tweet about Obamacare

Former President Barack Obama has spent the first 100 days of the Trump presidency largely out of the public eye, but he waded back into the fray on Tuesday -- sending perhaps his most politically charged tweet since leaving office in defense of his health care law.

Obama defended the law, which Republicans are currently working to repeal and replace, by retweeting a message shared the night before by late night talk show host Jimmy Kimmel.

SEE ALSO: Obama points out Obamacare is more popular than Trump

On Monday night, Kimmel tweeted a video of his show's monologue where he talked about the birth of his newborn son William, called Billy, who was found to have a congenital heart defect. The unusually personal and political monologue included a direct plug for Obamacare.

FLASHBACK: Obama's first 100 days

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Looking back at President Obama's first 100 days
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Looking back at President Obama's first 100 days

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Obama authorized SEAL mission to take out Somali pirates

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Obama retweeted Kimmel's plea on Tuesday.

"Well said, Jimmy," he wrote. "That's exactly why we fought so hard for the ACA, and why we need to protect it for kids like Billy. And congratulations!"

Obama has remained mostly quiet on political issues since leaving office. He only touched lightly on politics during his first public appearance in Chicago last week. His tweets have avoided the nitty gritty of policy, instead offering condolences to victims of terror attacks, mourning the loss of musical icon Chuck Berry and wishing his wife a happy Valentine's Day.

SEE MORE: Former President Obama's latest appearance sets internet on fire

He has not mentioned Trump.

But the tweet comes amid Republican leaders' efforts to bring their health care replacement plan to a vote. Trump had originally vowed to see Obamacare repealed and replaced during his first 100 days in office -- a promise he was unable to keep.

SEE MORE: Mural of Michelle Obama sparks huge controversy

Republicans in Congress are moving toward trying to pass a new version of the repeal legislation this week, but it's unclear whether or not they have the votes to accomplish that goal.

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The Obamas post-presidency
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The Obamas post-presidency
ORLANDO, FL - APRIL 27: Former United States first lady Michelle Obama smiles during a conversation at the AIA Conference on Architecture 2017 on April 27, 2017 in Orlando, Florida. Michelle Obama is making one of her first public speeches at the Orlando Conference since leaving the White House. (Photo by Gerardo Mora/Getty Images)
Former U.S. President Barack Obama speaks during a meeting with youth leaders at the Logan Center for the Arts at the University of Chicago to discuss strategies for community organization and civic engagement in Chicago, Illinois, U.S., April 24, 2017. REUTERS/Kamil Krzaczynski
MUMBAI, INDIA - NOVEMBER 7, 2010: US President Barack Obama and his wife Michelle wave as they board Air Force One to depart for New Delhi from Chattrapati Shivaji International airport in Mumbai on Sunday. President Barack Obama left the Indian city of Mumbai for New Delhi. (Photo by Kunal Patil/Hindustan Times via Getty Images)
NEW YORK, NY - APRIL 18: Malia Ann Obama seen out in Manhattan on April 18, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - MARCH 29: Malia Ann Obama is seen in Tribeca on March 29, 2017 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NY - FEBRUARY 24: (EXCLUSIVE COVERAGE) The 44th President of The United States Barack Obama, poses backstage at The Roundabout Theatre Company's production of 'Arthur Miller's The Price' on Broadway at The American Airlines Theatre on February 24, 2017 in New York City. (Photo by Bruce Glikas/FilmMagic)
Former U.S. President Barack Obama sits on a boat during a kite surfing outing with British businessman Richard Branson during his holiday on Branson's Moskito island, in the British Virgin Islands, in a picture handed out by Virgin on February 7, 2017. Jack Brockway/Virgin Handout via REUTERS FOR EDITORIAL USE ONLY
THIS IMAGE IS BINNED Former U.S. President Barack Obama tries his hand at kite surfing during a holiday with British businessman Richard Branson on his island Moskito, in the British Virgin Islands, in a picture handed out by Virgin on February 7, 2017. Jack Brockway/Virgin Handout via REUTERS FOR EDITORIAL USE ONLY
Former U.S. President Barack Obama and British businessman Richard Branson sit on a boat during Obama's holiday on Branson's Moskito island, in the British Virgin Islands, in a picture handed out by Virgin on February 7, 2017. Jack Brockway/Virgin Handout via REUTERS FOR EDITORIAL USE ONLY
NEW YORK, NY - FEBRUARY 08: Malia Obama is seen arriving at The Weinstein Company on February 8, 2017 in New York, New York. (Photo by Alessio Botticelli/GC Images)
UNSPCIFIED, BRITISH VIRGIN ISLANDS - FEBRUARY 1: In this undated image Former President Barack Obama takes a break from learning to kitesurf at Richard Branson's Necker Island retreat on February 1, 2017 in the British Virgin Islands. Former President Obama and his wife Michelle have been on an extended vacation since leaving office on January 20. (Photo by Jack Brockway/Getty Images)
NEW YORK, NY - FEBRUARY 24: Malia Obama is seen walking in Soho on February 24, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - FEBRUARY 24: Malia Obama is seen walking in Soho on February 24, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - FEBRUARY 24: (EXCLUSIVE COVERAGE) Director Terry Kinney and The 44th President of The United States Barack Obama chat backstage at The Roundabout Theatre Company's production of 'Arthur Miller's The Price' on Broadway at The American Airlines Theatre on February 24, 2017 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - FEBRUARY 24: (EXCLUSIVE COVERAGE) (L-R) Malia Obama, The 44th President of The United States Barack Obama, Danny DeVito, Mark Ruffalo, Jessica Hecht and Tony Shalhoub pose backstage at The Roundabout Theatre Company's production of 'Arthur Miller's The Price' on Broadway at The American Airlines Theatre on February 24, 2017 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK - FEBRUARY 24: Malia Ann Obama is seen out in Manhattan with friend on February 24, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - FEBRUARY 24: Malia Ann Obama is seen out in Manhattan with friend on February 24, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - FEBRUARY 24: Malia Obama seen out in Manhattan on February 24, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - MARCH 10: Michelle Obama leaves Upland restaurant on March 10, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - MARCH 10: Barack Obama leaves Upland restaurant on March 10, 2017 in New York City. (Photo by James Devaney/GC Images)
ORLANDO, FL - APRIL 27: Former United States first lady Michelle Obama (L), and Robert A. Ivy, Executive Vice President and Chief Executive Officer of the American Institute of Architects greet the audience during the AIA Conference on Architecture 2017 on April 27, 2017 in Orlando, Florida. Michelle Obama is making one of her first public speeches at the Orlando Conference since leaving the White House. (Photo by Gerardo Mora/Getty Images)
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