Will it be possible to challenge the legal validity of the claims?

No court in the land will challenge the validity of my deed.

It challenged the validity of the way in which the 18th Amendment had been passed.

The validity of the coordination test is challenged by additional data, however.

It also continues to challenge the validity of affirmative action doctrine.

The validity of his basic hypothesis has not been seriously challenged.

Several reports have challenged the validity of the prescribing unit.

The validity of this statement has never been challenged.

He challenged the validity of the result, however, and entered the general election as a candidate against Parsons.