I almost dropped out of my chair with the morning news when George Stephanopoulos came up with this as I was settling in, as I am sure most people would. So I switched to the other news stations and found nothing on this so checked other sources and finally found some context. It was said in jest or mocking what some people have said about the former President, but without context it can be taken a long wait into much confusion...
www.theguardian.com
www.yahoo.com
www.politico.com
And video proclaiming much the same...
www.msnbc.com
Trump says he will be a dictator only on ‘day one’ if elected president

Trump says he will be a dictator only on ‘day one’ if elected president
At town hall event in Iowa with Fox News host Sean Hannity, the former president was asked to deny that he would use ‘power as retribution’
Donald Trump says he will be a 'dictator' only on 'day one.' Then he'll focus on drilling.
Donald Trump says he will be a 'dictator' only on 'day one.' Then he'll focus on drilling.
Former president and current Republican frontrunner Donald Trump mocks concern that he wants to be a dictator.
Trump: I won’t be a dictator ‘except for day one’

Trump: I won’t be a dictator ‘except for day one’
It's not clear if he meant that statement to be a promise, a quip or a threat.

And video proclaiming much the same...

Trump says he would be a dictator only on 'day one' of second term
During a Fox News town hall Tuesday, former President Trump responded to a question from host Sean Hannity if he would abuse his power if elected to a second term. Trump said he would be a dictator only on day one.

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