How can a binary search tree insert a new node at the root position?

To insert a new node at the root position in a binary search tree, the tree must be restructured by following these steps:

1. Create a new node with the desired value.
2. Compare the value of the new node with the value of the current root node.
3. If the new node's value is less than the root node's value, set the left child of the root node to be the current root node, and set the left child of the new node to be the previous left child of the root node.
4. If the new node's value is greater than the root node's value, set the right child of the root node to be the current root node, and set the right child of the new node to be the previous right child of the root node.
5. Set the new node as the new root of the binary search tree.

By following these steps, a new node can be inserted at the root position of a binary search tree while maintaining the binary search tree properties.