Martin Luther King Jr., his wife Coretta (right) and John Lewis (far right), lead a march from Selma to Montgomery, Alabama, March 1965 (Credit: AP) President Donald Trump’s attendance at the opening of the Mississippi Civil Rights Museum has understandably resulted in an outcry from would-be attendees — some of whom have backed out of appearing at the opening in protest against presidential policies that they believe undermine the ongoing struggle for civil rights.