Sen. Susan CollinsSusan Margaret CollinsCook Political Report moves Susan Collins Senate race to 'toss up' The Hill's Morning Report — Trump and the new Israel-'squad' controversy Trump crosses new line with Omar, Tlaib, Israel move MORE (R-Maine) announced Monday that she'll participate in the 50th anniversary march of "Bloody Sunday" this year.

Collins's announcement came on the same day as the Martin Luther King, Jr. holiday. In March 1965, civil rights activists led by King and Rep. John LewisJohn LewisCummings invites Trump to visit Baltimore House Democrat knocks Trump's Cummings tweet: 'This guy is a terrible, terrible human being' George Wallace's daughter: 'I saw Daddy a lot' during 2016 election MORE (D-Ga.) marched from Selma to Montgomery along the Edmund Pettus Bridge. Violence ensued upon an encounter with police on the bridge.

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Collins said she was invited by Sen. Tim Scott (R-S.C.), the first African American since Reconstruction to represent the South in the Senate.

"I will have the honor to march and stand alongside that same John Lewis - now Congressman John Lewis – and with Senator Tim Scott, the first African-American Senator elected from the South since 1881. We will stand on the Edmund Pettus Bridge," Collins said in a statement.

Lewis will lead a bipartisan delegation to visit historic sites in Selma and Montgomery from March 6 to 8.