I see multiple scenarios:

1. A crazy person with TDS tries to take him out.

Years of propaganda and fear mongering getting to someone's head, until they finally snap. 

2. Deep state attempts to take him out.

Trump is too destabilizing to their power, and must be delt with. 

3. He put a fake hit on himself to rile up the base.

Creating this illusion will further empower him as the hero fighting against a corrupt system, that he is part of.