A single speech is not likely to change the trajectory of the Russian Candidate's detractors. 

He has burnt too many bridges, poked a stick into too many hornet nests, is proposing too many drastic changes to government programs that affect too many people.

The only thing he can do to change the way things are going would be to rescind his proposed ramp up of military spending, rescind his plan to scrap Obamacare, rescind his plan to drastically cut spending at the EPA and other agencies and................

.. acknowledge that global warming is real and a danger to humanity as well as all life on the planet.