Aug. 31 (UPI) — The Supreme Court ruled Monday that President Donald Trump’s massive, $400 million White House ballroom project can continue — over dissent from Chief Justice John Roberts and three other justices.

In the 5-4 ruling, the high court said the National Trust for Historical Preservation likely lacks the legal right to challenge the project and that national security reasons favor its continuation. This could give the Trump administration time to finish the project as lawsuits over it continue.

The court did not say if the project was legal. In a dissent, Roberts said that it likely is not, as the project was not approved by Congress.

“The White House is not just any building,” he wrote. “In failing to appreciate as much, the court misconceives the plaintiff’s injury, allowing the executive’s likely infringement of the legislature’s power of the purse and authority to regulate federal property in the District of Columbia to continue.”

Roberts called Monday’s decision “no victory for the separation of powers.”

The decision replaces a temporary court order from earlier August that allowed construction to continue.

Federal courts said earlier that the ballroom project needed to halt because it had not been approved by Congress. Administration lawyers had argued that Trump has total authority to renovate federal buildings and that the ballroom and connected security features are necessary.

The nearly 90,000-square-foot ballroom will be located on the former site of the East Wing, which Trump ordered demolished. The president initially said that it would be paid for by private donations, but The Washington Post has reported that the project (which it estimated will cost$600 million) will include $300 million in tax dollars.