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Former President Barack Obama, addresses the service during the funeral for the late Rep. John Lewis, D-Ga., at Ebenezer Baptist Church in Atlanta, Thursday, July 30, 2020.  (Alyssa Pointer/Atlanta Journal-Constitution via AP, Pool)
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Former President Barack Obama, addresses the service during the funeral for the late Rep. John Lewis, D-Ga., at Ebenezer Baptist Church in Atlanta, Thursday, July 30, 2020. (Alyssa Pointer/Atlanta Journal-Constitution via AP, Pool)
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Former President Bill Clinton speaks during the funeral service for the late Rep. John Lewis, D-Ga., at Ebenezer Baptist Church in Atlanta, Thursday, July 30, 2020. (Alyssa Pointer/Atlanta Journal-Constitution via AP, Pool)
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The casket of former Rep. John Lewis (D-GA) arrives for a memorial service in the Capitol Rotunda on July 27, 2020 in Washington, DC. Lewis, a civil rights icon and fierce advocate of voting rights for African Americans, will lie in state at the Capitol. Lewis died on July 17 at the age of 80. (Photo by Shawn Thew-Pool/Getty Images)
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The casket of former Rep. John Lewis (D-GA) arrives for a memorial service in the Capitol Rotunda on July 27, 2020 in Washington, DC. Lewis, a civil rights icon and fierce advocate of voting rights for African Americans, will lie in state at the Capitol. Lewis died on July 17 at the age of 80. (Photo by Shawn Thew-Pool/Getty Images)
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The casket of Rep. John Lewis moves over the Edmund Pettus Bridge by horse drawn carriage during a memorial service for Lewis, Sunday, July 26, 2020, in Selma, Ala. Lewis, who carried the struggle against racial discrimination from Southern battlegrounds of the 1960s to the halls of Congress, died Friday, July 17, 2020. (AP Photo/John Bazemore)
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The casket of Rep. John Lewis moves over the Edmund Pettus Bridge by horse drawn carriage during a memorial service for Lewis, Sunday, July 26, 2020, in Selma, Ala. Lewis, who carried the struggle against racial discrimination from Southern battlegrounds of the 1960s to the halls of Congress, died Friday, July 17, 2020. (AP Photo/John Bazemore)
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The casket of Rep. John Lewis moves over the Edmund Pettus Bridge by horse drawn carriage during a memorial service for Lewis, Sunday, July 26, 2020, in Selma, Ala. Lewis, who carried the struggle against racial discrimination from Southern battlegrounds of the 1960s to the halls of Congress, died Friday, July 17, 2020. (AP Photo/John Bazemore)
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The casket of Rep. John Lewis moves over the Edmund Pettus Bridge by horse drawn carriage during a memorial service for Lewis, Sunday, July 26, 2020, in Selma, Ala. Lewis, who carried the struggle against racial discrimination from Southern battlegrounds of the 1960s to the halls of Congress, died Friday, July 17, 2020. (AP Photo/John Bazemore)
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WASHINGTON, DC - FEBRUARY 15:  U.S. Rep. John Lewis (D-GA) (R) is presented with the 2010 Medal of Freedom by President Barack Obama during an East Room event at the White House February 15, 2011 in Washington, DC. Obama presented the medal, the highest honor awarded to civilians, to twelve pioneers in sports, labor, politics and arts.  (Photo by Alex Wong/Getty Images)
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WASHINGTON, DC - FEBRUARY 15: U.S. Rep. John Lewis (D-GA) (R) is presented with the 2010 Medal of Freedom by President Barack Obama during an East Room event at the White House February 15, 2011 in Washington, DC. Obama presented the medal, the highest honor awarded to civilians, to twelve pioneers in sports, labor, politics and arts. (Photo by Alex Wong/Getty Images)
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UNITED STATES - DECEMBER 3: Rep. John Lewis, D-Ga., waits to enter the Senate chamber to listen to the farewell address of the Sen. Johnny Isakson, R-Ga., in the Capitol on Tuesday, December 3, 2019. (Photo By Tom Williams)
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UNITED STATES - DECEMBER 3: Rep. John Lewis, D-Ga., waits to enter the Senate chamber to listen to the farewell address of the Sen. Johnny Isakson, R-Ga., in the Capitol on Tuesday, December 3, 2019. (Photo By Tom Williams)
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WASHINGTON, DC - SEPTEMBER 25: U.S. Rep. John Lewis (D-GA) listens during a news conference September 25, 2017 on Capitol Hill in Washington, DC. Reps Lewis was joined by Demetrius Nash, who took a walk from Chicago to Washington, to discuss gun violence. (Photo by Alex Wong/Getty Images)
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CNN —  

Civil rights icon and US Rep. John Lewis of Georgia was released from the hospital Sunday evening with a “clean bill of health,” his spokeswoman said.

“All tests have been completed,” Brenda Jones said in a statement. “He thanks everyone who shared their thoughts, prayers and concerns during his stay.”

Lewis became ill Saturday on a flight to Atlanta, CNN affiliate WSB-TV reported, quoting unnamed sources.

Lewis, 78, has represented Georgia’s 5th Congressional District, which includes much of Atlanta, since first being elected in 1986.

In February 2011, President Barack Obama presented Lewis with the Presidential Medal of Freedom, the country’s highest civilian honor.

The long-serving Democrat was a young activist and leader of the Student Nonviolent Coordinating Committee when, in March 1965, he joined forces with Martin Luther King Jr. to lead a voting rights march out out Selma, Alabama.

But as the nonviolent demonstrators approached the Edmund Pettus Bridge, on their way to the state capital in Montgomery, they were confronted by heavily armed state troopers and local police. When the march refused to turn back, protesters were set upon and beaten.

The images from “Bloody Sunday” – and Lewis, who was photographed under assault and suffered a fractured skull – helped galvanize support for the Voting Rights Act, which was signed into law by President Lyndon B. Johnson months later.

CNN’s Gregory Krieg contributed to this report.