Ivanka Trump said one of the reasons Republicans and others have been hesitant to support her father's bid for president is because they are afraid of how successful he has been thus far.

"They're scared," Trump told the Detroit Free Press following the GOP nominee's economic speech in Motor City on Monday. "They never thought that he'd be where he is."

The 34-year-old mother of three and businesswoman said it is difficult for her to understand why others do not see her father for the kind man she sees him as. Trump theorized it may be because they expected him to diminish during the primaries, but that has not been the case despite his recent drop in national polls.

"I think there will be many people who will seek to diminish him," she added.

The billionaire businessman will continue to campaign with his unique message and tone, his daughter said, explaining it's the reason he has succeeded thus far.