Top White House officials are blocking strict new federal guidelines for the emergency release of a coronavirus vaccine, objecting to a provision that would almost certainly guarantee that no vaccine could be authorized before the election on Nov. 3, according to people familiar with the approval process.

Facing a White House blockade, the Food and Drug Administration is seeking other avenues to ensure that vaccines meet the guidelines. That includes sharing the standards — perhaps as soon as this week — with an outside advisory committee of experts that is supposed to meet publicly before any vaccine is authorized for emergency use. The hope is that the committee will enforce the guidelines, regardless of the White House’s reaction…

The vaccine guidelines carry special significance: By refusing to allow the Food and Drug Administration to release them, the White House is undercutting the government’s effort to reassure the public that any vaccine will be safe and effective, health experts fear.