In a letter obtained Thursday by The Associated Press, Corrections Secretary Matthew Cate tells a court-appointed receiver that the state cannot afford the $1.9 billion fix Cate agreed to last month.Schwarzenegger said in a statement Thursday that California cannot afford the additional cost.The Schwarzenegger administration has rejected a plan designed to end years of litigation over inmate medical care in California’s prison system.In saying Thursday that fiscal times are not right to spend $1.9 billion on long-term health care beds for prisoners, Gov. Arnold Schwarzenegger’s administration has put itself on track for a new head-on collision with the federal courts.The governor, who is a defendant in that case, submitted a plan that was contingent on the plan that he just decided not to execute.