bring reason

The construction reason is because is criticized in a number of usage guides:  The reason for the long delays was because the costs greatly exceeded the original estimates.  One objection to this construction is based on its redundancy: the word because (literally, by cause) contains within it the meaning of reason; thus saying the reason is because is like saying “The cause is by cause,” which would never be said. A second objection is based on the claim that because can introduce only adverbial clauses and that reason is requires completion by a noun clause. Critics would substitute that for because in the offending construction:  The reason for the long delays in completing the project was that the costs. …  Although the objections described here are frequently raised, reason is because is still common in almost all levels of speech and occurs often in edited writing as well.  A similar charge of redundancy is made against the reason why, which is also a well-established idiom:  The reason why the bill failed to pass was the defection of three key senators.