He's a Civil Rights icon, a U.S. Congressman from Georgia, a Presidential Medal of Freedom winner and, as of Tuesday, John Lewis is 77 years old.

It's already been quite a year for Lewis. In January, controversy erupted when he said that he didn't see then-President-elect Donald Trump as "legitimate president" and stated he'd skip the inauguration.

President Trump later responded in a tweet, saying that Lewis' 5th congressional district in Atlanta was "crime-ridden" and "in horrible shape."

After the feud, sales of Lewis' graphic novel and memoir skyrocketed.

Lewis has remained largely quiet on Twitter since the end of January. But on Tuesday, many took time to wish him a happy birthday:

PHOTOS: John Lewis in Selma, Alabama for the 50th Anniversary of Bloody Sunday