I have a brain tumor also trigeminal neuralgia. I'm planning on the brain surgrey tumor on the trigeminal neuralgia nerve. Can they remove the tnnerv?

Usually No. It sounds like you have a tumor (usually a meningioma or schwannoma) attached to the trigeminal nerve. This can cause the facial pain that you note. When surgery is done for this, the neurosurgeon can usually peel the tumor away from the nerve. Some fibers of the nerve can be sacrificed hopefully with minimal neurologic sequelae. This is a big nerve and it controls facial sensation and chewing.
Not good option. If the tumor is pressing on the trigeminal nerve, decompressing the nerve can help. If unrelated the two problems should be handled independently.