Can the employer move forward as planned with the PIP? What obligations, if any, might arise under the ADA after this disclosure?

Week 4: Discussion:

Feel free to answer all three prompts, or choose just a couple.

An employer issues a Performance Improvement Plan (PIP). In response to the PIP, the employee discloses for the very first time a disability.

Can the employer move forward as planned with the PIP?

What obligations, if any, might arise under the ADA after this disclosure?