What is the appropriate standard for determining causation under the ADA?

QUESTION PRESENTED The Americans with Disabilities Act (ADA) forbids discrimination “on the basis of” disability, but does not specifically set forth the standard to be applied in determining causation are the “motivating factor” " standard most consistent with the plain language and purposes of the statute, and Congressional intent, and therefore the appropriate standard to be applied under the ADA? 2. Is the employer liable under ADA if there are multiple But-for reasons for an employee’s termination and disability was one those reason? :