Construction of the underground and above ground portions of US President Donald Trump's White House ballroom will be allowed to continue, an appeals court has ruled. The US Court of Appeals for the District of Columbia granted an administrative stay after the Trump administration appealed against US District Judge Richard Leon's decision to halt above-ground construction on Thursday. Following the ruling, Trump criticized the lower court's decision, saying it attempted to hinder the ability of future presidents to conduct meetings securely. The ballroom is set to accommodate 1,350 guests and is expected to cost around $400 million, funded by private donations. The initial halt to the project was based on arguments that proper procedures were not followed before construction began, according to a lawsuit filed by the National Trust for Historic Preservation.