Yes, I believe he is INSANE, HAS A MENTAL DISORDER, by my psychological evaluation of his behavior all his life and that is the real reason he should not be president. Never trust anything an insane person says because THE PERSON IS INSANE.
What you saw him say this morning is the real him, not reading off a teleprompter. He will never stop trashing Cruz, Heidi, Cruz's father because Cruz will not endorse. Cruz could stop this by becoming, as Cruz said, a "servile puppy dog" to Trump. When I say Trump will never stop dumping on Cruz, below is a link to show he will keep trashing a person who rejects him, for 20 years and only stops when a law suit against him is threatened.
"Selina Scott, English reporter, reveals how Donald Trump failed to seduce her... then stalked her for 20 YEARS."
http://www.dailymail.co.uk/news/article-3424519/The-comb-creep-hates-women-know-SELINA-SCOTT-reveals-Donald-Trump-failed-seduce-stalked-20-years.html
Do read that to see the real Trump when the public is not watching.
Victoria, I saw dozens of mini-Trumps during my 8 years in the Army. Their "leadership" style was: when things are going well, it's due to their leadership. When things don't go so well, it's because everybody else is screwing up. That's why Trump will never sufficiently staff up to run a winning national campaign. With Trump (and Manafort), it's all about them.
I never considered myself anything more than a good officer who worked with great soldiers and NCOs. We got some great things accomplished, and I was never afraid to stick my neck out. My last Battalion Cdr in Germany demanded independence and imagination from his officers, and I thrived under his leadership. Oh, he chewed my rear on multiple occasions (I was a mere LT at the time), but I knew it was forgotten the minute I left his office.
It's inevitable that Trump would find a number of people who revere him. From my experience, I doubt I would last long with Trump, but who knows?