(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.

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