Those of us who have dealt with these diseases understand that symptoms may be masked for some time and that patients may benefit from early intervention. Assessment of cognitive function is not purely subjective, but objective as well. The results of this exam, along with global, not specific results that the American people are used to receiving following presidential physicals, would put to rest any speculation as to Trump's mental functioning. If he is diagnosed with cancer, diabetes or hypertension, we should know, and he should be treated. In similar fashion, if he has a decline in mental capacity, we should be informed. If the case is severe, Vice President Mike Pence and the leaders of Congress should have the fortitude, honesty and patriotism to invoke the 25th Amendment, and Trump should step down. If he is given a clean bill of health, we must simply deal with him for the foreseeable future.