During the execution phase of a construction project, you, the project manager, discover that the materials delivered do not meet the specifications outlined in the project scope. This has led to a critical issue affecting the structural integrity of the building. What should be your first step in collaborating with relevant stakeholders to resolve the issue?
Issue a change request to replace the substandard materials.
Instruct the project team to halt all construction activities until new materials are delivered.
Organize an urgent meeting with the suppliers, your quality control team, structural engineers, and the client to discuss the issue and potential solutions.
Document the issue in the issue log and send it in the weekly status report to stakeholders.