A war of words between President-elect Donald Trump and civil rights icon Rep. John Lewis, D-Ga., is one of the many reasons why more than 50 Democratic lawmakers say they will boycott the upcoming inauguration.

The fight began when Lewis told NBC News he didn't believe Trump was a legitimate president because of interference by the Russians.

Trump then went on Twitter to say Lewis should focus on his district, and that he was "all talk, talk talk — no action or results. Sad!"

Some have cited Trump's comments to Lewis, who marched with Martin Luther King Jr., as reason to not attend the inauguration. Others had said they would skip the ceremony prior to the comments, citing Trump's past comments about women, illegal immigrants, Muslims or the LGBT community.

"For me, the personal decision not to attend [the] inauguration is quite simple: Do I stand with Donald Trump, or do I stand with John Lewis? I am standing with John Lewis," said Rep. Ted Lieu, D-Calif., said in a statement Saturday, also citing other Trump comments as "un-American.''

Rep. Luis Gutierrez, D-Ill., was one of the first congressmen to say he would not attend the inauguration.

"I could not look my wife, my daughters, or my grandson in the eye if I sat there and attended, as if everything that the candidate said about the women, the Latinos, the blacks, the Muslims, or any of those other things he said in those speeches and tweets, and that all of that is okay or erased from our collective memory," he said on the House floor in December. Gutierrez will instead attend the Women's March on Washington.

Castro won't attend the inaguration because "[w]innnign an election does not mean a man can show contempt for millions," the Texas Democrat said in a statement.

According to their own statements and various news reports, here is a list of Congress men and women who will be skipping Friday's festivities.

Alma Adams, North Carolina

Karen Bass, California

Don Beyer, Virginia

Earl Blumenauer, Oregon

Brendan Boyle, Pennsylvania

Robert Brady, Pennsylvania

Anthony Brown, Maryland

G.K. Butterfield, North Carolina

Tony Cárdenas, California

Joaquin Castro, Texas

Judy Chu, California

Katherine Clark, Massachusetts

Yvette Clarke, New York

Lacy Clay, Missouri

Steve Cohen, Tennessee

Bonnie Watson Coleman, New Jersey

John Conyers, Michigan

Peter DeFazio, Oregon

Mark DeSaulnier, California

Llloyd Doggett,Texas

Mike Doyle, Pennsylvania

Keith Ellison, Minnesota

Adriano Espaillat, New York

Dwight Evans, Pennsylvania

Marcia Fudge, Ohio

Ruben Gallego, Arizona

Al Green, Texas

Raúl Grijalva, Arizona

Luis Gutiérrez, Illinois

Alcee Hastings, Florida

Jared Huffman, California

Pramila Jayapal, Washington

Barbara Lee, California

John Lewis, Georgia

Ted Lieu, California

Dan Lipinski, Illinois

Zoe Lofgren, California

Jerry McNerney, California

Jerry Nadler, New York

Grace Napolitano, California

Donald Payne Jr., New Jersey

Chellie Pingree, Maine

Mark Pocan, Wisconsin

Mike Quigley, Illinois

Jamie Raskin, Maryland

Lucille Roybal-Allard, California

Raul Ruiz, California

Kurt Schrader, Oregon

José Serrano, New York

Carol Shea-Porter, New Hampshire

Louise Slaughter, New York

Adam Smith, Washington

Darren Soto, Florida

Mark Takano, New York

Bennie Thompson, Mississippi

Juan Vargas, California

Nydia Velázquez, New York

Maxine Waters, California

Frederica Wilson, Florida

John Yarmuth, Kentucky

This list will be updated as applicable.

After reading classified Russian hacking doc & @realDonaldTrump offensive tweets to @repjohnlewis I will not be attending the Inauguration. pic.twitter.com/wrEeGfqjrZ — Rep. Mark Pocan (@repmarkpocan) January 15, 2017

I will NOT attend the inauguration of @realDonaldTrump. When you insult @repjohnlewis, you insult America. — Yvette D. Clarke (@RepYvetteClarke) January 14, 2017

Announced @ Mason Temple, #MLK final speech, that I won't attend #inauguration out of respect for @repjohnlewis & for unpresidential remarks — Steve Cohen (@RepCohen) January 16, 2017

I will not celebrate a man who preaches a politics of division and hate. I won't be attending Donald Trump's inauguration. — Rep. Keith Ellison (@keithellison) January 16, 2017

Today I released the following statement about the inauguration of President-elect Donald Trump. pic.twitter.com/gJsFkO55Me — Alma S. Adams (@RepAdams) January 17, 2017

After receiving an overwhelming response on the twitter poll, I've decided not to attend the inauguration of President-elect Trump. pic.twitter.com/ig4kFn0GGH — Congressmember Bass (@RepKarenBass) January 17, 2017

After prayerful consideration, I cannot in good conscious attend the inaugural ceremony for President-elect Donald Trump. (1/3) — G. K. Butterfield (@GKButterfield) January 17, 2017