Answer: 1. by declaring some of it unconstitutional
The program deemed unconstitutional was the Agricultural Adjustment Act and the National Recovery Administration.
The Supreme Court declared them unconstitutional because Roosevelt was using his authority as president unlawfully: the federal government was acting outside of its line of authority.
The New Deal legislation was not sent back to Congress, rather, a decision was made, and it was rejected. The court also did not suggest a judicial reform bill, nor did it uphold the Tennessee Valley Authority.