"The things that would worry me, I guess just that we didn't have the full support of the Republican infrastructure," Trump Campaign manager Kellyanne Conway told MSNBC in an interview.
"When I say worry, it's just that it would really be too bad if we win narrowly and it's not because of the Democrats or this, that, or the other, it's because didn't have, we have former presidents not voting for us, we have former nominees not voting for us," she said.
The column on the ballot was left blank, Bush's spokesman said.
"That's got to hurt. When you talk about growing the party, the idea was growing it, but having that base together and I think it very unfortunate," she said in response to a question.
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Conway asserted that Trump has six or seven paths to victory.
"The guy's a winner. He has been an incredibly self-made success story, real American success story. Then on the other hand, when he has had set backs in his business, he had taken chances, that he always come out on top. I think this is somebody who is nimble, is resilient," she said.
She said Trump is a man who left the race the way he began.
"On his own terms, just taking that case to the people getting oxygen from these unbelievable crowds, and feeling like he had elevated a number of issues, like trade and immigration and patriotism, that otherwise may have been left on the table," Conway said.