President Bush is urging senior citizens to enroll in the new Medicare prescription drug plan by its May 15 deadline.

Mr. Bush issued the call Tuesday as he visited seniors in the Midwestern U.S. states of Missouri and Iowa to discuss the program. The president told his audiences that 29 million Americans are already participating in the program intended to give them choices and save them money.

The president's chief Medicare official, Mark McClellan, said more than 1,000 enrollment seminars are planned around the country this week to raise awareness about the program.

Democrats have said the numerous options in the plan confuse senior citizens and will cost them more money. Mr. Bush has acknowledged problems with the plan since its January debut, but says his administration has straightened them out.

Some information for this report was provided by AP and Reuters.