Biden’s presidential proclamation rescinded the national emergency declaration used by President Donald Trump to divert about $10 billion from Defense Department accounts toward the barrier, one of the costliest federal infrastructure projects in U.S. history.

It directs private contractors to stop work “as soon as possible but in no case later than seven days,” while launching a full assessment of the project to determine whether its funding sources are legal and whether they can be allocated elsewhere.

“It shall be the policy of my Administration that no more American taxpayer dollars be diverted to construct a border wall,” Biden’s proclamation states. “I am also directing a careful review of all resources appropriated or redirected to construct a southern border wall.”

The proclamation also directs federal agencies to formulate a plan within 60 days to redirect border wall funds and “resume, modify, or terminate” segments of the structure that remain under construction.