Rep. Floyd Spence, R-S.C., has taken a turn for the worse and is suffering pneumonia and an attempt by his body to reject the lungs he received in a May 7 transplant, doctors say.

"It's a definite setback. No question about it. His condition is pretty serious," Dr. Seshadri Raju, who led the University of Mississippi Medical Center transplant team, said Monday.

The 60-year-old South Carolina Republican, who suffered from emphysema, overcame earlier episodes of infection and rejection and had been doing well enough in a private room to walk with assistance and ride a stationary cycle.