ROCK HILL -- A South Carolina congressman diagnosed with Parkinson's disease lashed out Tuesday at the National Republican Congressional Committee for issuing a statement he is losing his memory.

Democratic Rep. John Spratt characterized the GOP statement that called him an "amnesiac" as "a sly, underhanded reference" to his ailment.

"There are many reasons to run again, but I would never consider it if I did not have the energy, motivation, and mental ability to do this job, and do it well," Spratt said in a statement.

He said he has only a slight tremor in his hand and slightly stooped posture but no loss of mental capacity.

The national GOP statement issued Monday contained six bold-lettered allegations that he's forgetting what's happening in Washington.

Spratt is in a tough re-election battle this year. He announced he was suffering from Parkinson's on March 30 as he filed to run for a 15th term. He says the disease is in its early stages and progressing slowly.