"President Trump's attendance and his hurtful policies are an insult to the people portrayed in this civil rights museum", Mr Lewis, who was scheduled to speak at the event, said in a joint statement with Representative Bennie Thompson.
The NAACP has also voiced opposition to Trump's attendance at the museum opening.
Rep. John Lewis told the Atlanta Journal-Constitution he is canceling is trip to the new Mississippi Civil Rights Museum because he doesn't want to share a stage with President Trump.
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Mr. Trump lashed out at the congressman the next day on Twitter, saying his congressional district, which includes three-quarters of Atlanta, was "in terrible shape and falling apart (not to mention crime infested.)" He also said the civil rights icon was "all talk, talk, talk - no action or results".
"We are telling a much longer story in the Museum of Mississippi History, a much deeper story in the Mississippi Civil Rights Museum", noted Katie Blount, director of the Mississippi Department of Archives and History. "We support the people that are being honored and we're very happy about the civil rights museum opening and we're acknowledging all the hard work that went into the creation of the museum".
Its displays include a charred cross burned by the Ku Klux Klan, the places and dates of MS lynchings, and the rifle used to murder the civil rights activist Medgar Evers. "He has never been a supporter of civil rights or equal opportunity or justice".
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That's right: The president thinks it's unfortunate that Lewis would not honor the sacrifice made by civil right leaders such as, well, Lewis. And would I hope that those individuals would join in that celebration instead of protesting it. The lawmaker said it was not appropriate for Trump to be invited given his response to white supremacist rallies in Charlottesville, Va., this summer. The congressman also refused to attend Trump's inauguration and first congressional address.
"Congressman John Lewis should finally focus on the burning and crime infested inner-cities of the US", Mr Trump tweeted in January.
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