No, that's not a headline from The Onion.
The United States Supreme Court issued a ruling this morning on whether the main entrance to the Supreme Court Building (at the top of the marble steps) should remain open to the public. They decided "no" in a 7-2 decision, citing security concerns, so the public entrance will be closed starting tomorrow.
The Court’s statement on the issue is here, and the Breyer-Ginsburg "dissent" is here (PDF). The 2-page dissent is worth a read, noting the architectural significance of the front steps, and also noting that no other Supreme Court in the world has closed its front entrance.