Experts Doubt Adding a Fifth President to Mount Rushmore

Some people have suggested adding a new face to Mount Rushmore.

However, experts say it's not possible because the rock isn't good enough.

The monument already has faces of important U.S. presidents: George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln.

These presidents represent the birth, growth, and preservation of America.

The original sculptor also thought it would be difficult to add a fifth face.

Even though some people like the idea, the rock is too weak, and the monument is considered great art as is.