The way for President Trump to handle the newly energized collusion investigation by is massive retaliation...

1. Trump should advocate in public, and then if necessary assert through his authority, that the investigation of the election by Mueller is to be expanded to include all participants and all activities in the campaign without limit.

Mueller's new charge would be "to determine whether there were any irregularities of any nature whatsoever in the 2016 campaign from any source whatsoever," with a special focus and separate report on the violence at Trump rallies.  This separate report will include a description of the participants in the violence; their method of organization and transportation; their leadership – including the roles of Robert Creamer and Scott Foval, if any – and how, by how much, and from whom they were financed.

The point is that Trump doesn't fire Mueller, but rather, in the interest of justice, expands his remit.

2. Then the second thing Trump does is to get a special counsel appointed to investigate whether the use by Hillary Clinton as secretary of state of unsecured communications did any damage to the national security and national interests of the United States in any way whatsoever and to prosecute any violations of the law found in the course of that investigation, including any irregularities in past investigations.

Also investigate how, if at all, the joint income of Hillary and Bill Clinton of $85 million during Hillary Clinton's tenure as secretary of state was related to her official duties and to prosecute any illegalities therefrom.

3. Then the third thing Trump does is to get a special counsel appointed to investigate whether the payoffs by Congress to persons charging sexual misconduct by congresspeople were in-kind contributions to their campaigns at any point in time and whether they covered up any crimes by congresspeople and to prosecute those crimes.  Also investigate any possible involvement by their associates and families, and prosecute them if involved.

His argument: These critical issues have been brought to his attention by the investigation of Mueller and, in the case of Secretary Clinton, by his greater understanding of the importance of secrecy in national communications now that he is president.  There's also the importance of probity in office and of not profiting from public service in order to properly serve the public, which is a theme of his administration.

Massive retaliation.  The Republic is at stake.