In 1986, Jefferson Beauregard Sessions III was—correctly!—deemed by a Republican Senate to be too racist to serve on the U.S. District Court. This was a highly uncommon step: Sessions at the time was the second federal judicial nominee in 50 years to be rejected by the Senate Judiciary Committee. However, the bipartisan consensus that open racism is unacceptable is, alas, now completely shattered. In the logical culmination of the Republican Party’s transformation from the party of Abraham Lincoln to the party of John Calhoun, President-elect Donald Trump has nominated Sessions to be the top law enforcement office in the United States.

It is hard to overstate what a calamity this is. The Civil Rights Act and the Voting Rights Act are just paper without active federal enforcement. The Civil Rights Division in the Department of Justice, for example, has to decide what kinds of cases to prosecute, what kinds of problems need to be prioritized, and how the law should be interpreted and applied. Under both Eric Holder and Loretta Lynch—the first African-American man and woman, respectively, to serve as attorney general—President Barack Obama’s DOJ had a strong record of advancing the rights of African-Americans, women, LBGT people, and the disabled. Obama’s DOJ was also especially active on behalf of voting rights.

The DOJ is about to change course, hurtling back towards Jim Crow. When he was a U.S. Attorney, Donald Trump’s nominee for attorney general declared that “I wish I could decline on all” civil rights cases. Sessions called the NAACP and the ACLU “un-American” and “communist-inspired” organizations. He joked that he used to think the Ku Klux Klan were “ok” until he found out they were “pot smokers.” He once called a black former assistant U.S. Attorney “boy.”

And his actual record is arguably even worse. “Jeff Sessions got his start prosecuting voting rights activists in Alabama on bogus voter fraud charges,” notes Sam Bagnestos, a professor at the University of Michigan Law School and the number two official in the DOJ’s Civil Rights Division under Holder. “Throughout his career, he has shown hostility to the historically important work of the Civil Rights Division. The damage he can do to civil rights enforcement as attorney general is incalculable.” Nothing about his subsequent history suggests that he’s changed.

The consequences of this will be dire. States will likely be able to pass discriminatory vote-suppression legislation with impunity. It will be much harder for workers facing racial and gender discrimination to get the remedies to which they’re legally entitled. Sessions—who has been nominated in part because of FBI director James Comey’s unconscionable decision to violate Justice Department rules and intervene in the election—will be a disaster for victims of unjustified police violence.