The most controversial part of his plan is his inclusion of money for building a missile defense system. The defense system is to shoot down incoming missiles from enemies. But construction would not be easy. Many say it would be very costly to make and that the technology is not advanced enough to guarantee that it would even work when finished. Bush wants workers to invest some of their social security money in the stock market.
Social security is a tax every worker pays into the system to save for retirement.
The government keeps the money until you retire, then gives it back to you as monthly payments. But with so many people due to retire in future decades, some say the system will go broke and needs help. Bush says people should be able to invest some of their social security tax in stocks. The recent fall of stock prices might put this idea on hold because people have become afraid of investing. Bush wants to give money to religious groups that help people in need.