The Republican Party issued a new salvo in the health debate Monday with a "seniors' health care bill of rights" that opposed any moves to trim Medicare spending or limit end-of-life care to seniors.

Intended as a political shot at President Barack Obama, the Republican National Committee manifesto marks a remarkable turnaround for a party that had once fought to trim the health program for the elderly and disabled, which last year cost taxpayers over $330 billion.

The...