Judge again blocks above-ground White House ballroom construction while allowing some underground security work

What construction can still continue under the judge's order?

Leon said below-ground work on national security facilities, including a bunker, may continue. He also allowed only the above-ground work strictly necessary to cover, secure, and protect those underground facilities, so long as it does not lock in the ballroom's final size and scale PBS.org,Aol,CNBC.

Why did the judge issue a new ruling instead of leaving his earlier order in place?

The revised order followed direction from a federal appeals court, which told Leon to clarify or reconsider how his earlier construction halt affected asserted national-security needs at the site PBS.org,Aol,Daily Mail.

Who challenged the ballroom project in court?

According to BBC's report, the National Trust for Historic Preservation sued over the project, arguing the White House began construction without required planning and environmental steps and without congressional authorization BBC.