Senator Hatrack said "Do you remember who sent in troops into Little Rock, AR? It wasn't Sen. Fulbright (D-AR). It was Republican Pres. Eisenhower. In 1957 forced integration was a bad idea that was very necessary to reverse the Plessy v. Ferguson decision. Sometimes it takes a bad idea, forced desegregation, to correct an even worse one, forced segregation."
I'm old enough to have memories, though vague, of Little Rock. Eisenhower sent in the troops, federalized Arkansas National Guard, to enforce the 1954 Supreme Court decision on desegregation: Brown v Board of Education of Topika Kansas, and the desegregation agreement passed by the Little Rock School Board. On the day the Little Rock nine were to enter school, the Arkansas Governor sent in the National Guard "to preserve the peace" preventing the Little Rock Nine from entering the school they were registered to attend.
Thanks to Wikipedia for filling in the huge gaps and sharping my memories of that time. Little Rock Nine
So Eisenhower sent in the troops, to enforce a Supreme Court decision and to stop a rebellion of a state, in refusing to uphold the law of the land.