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Screenshot: CBS News

CBS News issued a sincere apology on Monday night for mixing up photos of the late Congressman Elijah Cummings and U.S. Rep. John Lewis, who announced he has stage 4 pancreatic cancer.

The mixup occurred on Monday's broadcast of CBS Evening News. A photograph of Cummings was mistakenly identified as Lewis. Cummings died of natural causes on Oct. 17, at age 68.

"Tonight on the 6:30 p.m. ET broadcast of the CBS Evening News, one photograph was misidentified as Congressman John Lewis. We have replaced the photo in all broadcasts and platforms. We deeply regret the error," CBS tweeted.

News of Lewis' cancer diagnosis prompted reactions from celebrities and lawmakers on social media.

Lewis, 79, said he will continue to serve in the House of Representatives while undergoing chemotherapy treatment for his cancer.

The civil rights leader once marched alongside Rev. Dr. Martin Luther King, Jr. to fight for the freedom of Black people to vote in U.S. elections.

But on Sunday, Lewis announced he is in the biggest fight of his life.

"I have been in some kind of fight - for freedom, equality, basic human rights - for nearly my entire life," he said.

"I have never faced a fight quite like the one I have now."

Lewis added: "I have a fighting chance."

Pancreatic cancer is one of the few cancers that can go undetected until it is too far advanced to treat.

Cheriss May/NurPhoto via Getty Images

Rep. Elijah Cummings, who was a frequent target of President Trump, has died at age 68. The Democratic leader died early Thursday at a hospice facility in his hometown of Baltimore, Maryland.

Cummings' staff said he battled "longstanding health issues" and he was taken to a hospice facility for "treatment". Hospice is for terminally ill patients who are nearing the end of life.

Cummings' health problems were not disclosed, but he was recently seen in a wheelchair in the halls of Congress.

Colleagues paid tribute to their fallen leader on Thursday.

"The news that our friend and colleague Elijah Cummings has passed away marks a sad day for the members of the United States Congress, the people of Baltimore, and the entire nation," said Rep. Liz Cheney (R-WY).

"His loss will be felt across our country," said Rep. Chrissy Houlihan (D-PA).

Cummings was first elected to Congress in 1996. He rose to become the top Democrat on the House Oversight Committee. He made headlines earlier this year when he objected to Trump referring to Baltimore as "rat- and rodent-infested.

Cummings, who represented Baltimore's majority-Black 7th Congressional District, attacked Trump for his administration's treatment of illegal immigrants arriving at the border.

Cummings was part of the House Democrats push to impeach Trump.

"We are going to uphold the rule of law," Cummings said in May after the White House attempted to stonewall the Mueller Russian collusion investigation.

"I'm begging the American people to pay attention to what is going on," Cummings said in a statement earlier this year. "Because if you want to have a democracy intact for your children, and your children's children, and generations yet unborn we've got to guard this moment. This is our watch."

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Rev. Al Sharpton (D) and former Maryland lieutenant governor Michael Steele (R) addressed comments made by President Donald Trump who attacked Baltimore Congressman Elijah Cummings as a "bully" and the city of Baltimore as crime and rat-infested.

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