The Constitution gives the president the power to grant a pardon to anyone, including himself, for offenses against the United States; therefore, the current investigation is a waste of time and taxpayer's money.
It has never happened and been litigated. However, the majority view is that a president can pardon himself (assuming he does so prior to impeachment). Art. II Sec. 2 of the Constitution states, in part, that the president "shall have power to grant reprieves and pardons for offenses against the United States, except in cases of impeachment."
Furthermore, there is no foolproof evidence that President Trump or anyone in his cabinet is guilty of a capital offense. A not guilty outcome will shame the Democrats and guarantee a second term for President Trump.
Marion C. Medwedeff