NAACP President Cornell William Brooks is demanding that Donald Trump apologize to Rep. John Lewis after the president-elect attacked the civil rights icon on Saturday.

“By disrespecting John Lewis, Donald Trump dishonored Lewis’ sacrifice & demeaned Americans & the rights, he nearly died (for). Apologize,” Brooks tweeted.

Lewis was slammed by the president-elect after he told NBC News’ Meet the Press that he doesn’t see Trump as a “legitimate president,” citing Russian interference in last year’s election. The full interview is set to air Sunday.

Trump called Lewis “All talk, talk, talk – no action or results.”

When asked whether or not he would try to build a relationship with the president-elect, Lewis said “it’s going to be very difficult. I don’t see this president-elect as a legitimate president.”

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Lewis also told NBC News that he does not plan on attending the inauguration next week. At least 20 other democrats have joined the boycott.

Brooks and the NAACP have been vigilant since throughout Trump’s transition. They NAACP most recently staged a sit-in last week at the office of Senator Jeff Sessions to protest his nomination as U.S. Attorney General. Check out’s exclusive interview with him here.