What check does judicial branch have if congress passes a bill that when enacted would be in violation of the american disabilities act?

If Congress enacted a bill that was in violation of the ADA, this is what would likely happen:

A citizen or a citizen's group would likely challenge the bill in Court. They would sue Congress, in essence.

A Federal District Court would hear the case. And then decide one way or another.

There is a chance that the Court would make it the entire way up to the Supreme Court.

Either way, though, the judiciary would review it (only after a case was brought) to determine whether the law was constitutional.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.