A Senate vote is also expected Wednesday.
Glenn was the first American to orbit the earth and was a member of NASA's storied Mercury Seven crew that led the U.S. into space. With Scott Carpenter's death in 2013, he became the crew's last surviving member. Glenn also piloted the first supersonic transcontinental flight in 1957.
He was elected to the U.S. Senate in 1974, serving until 1999. He returned to space in 1998, at age 77.
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