The poll also found the race is close across battleground states.
Gingrich was a top contender to serve as Trump's running mate.
Calvin Williams said the city is "prepared for it all."
"We think that the positions ... are in the mainstream of America," Paul Manafort said.
"There is no religious test on the table. It is simply limited to countries that are harboring or...
"He wanted to keep people guessing," Priebus said.
"What we are seeing are the desperate actions of an enemy that sees the noose closing."
Results in the NBC News/Wall Street Journal poll are unchanged since June.
Former UN ambassador Bill Richardson said Europeans are concerned about this year's election.
A Homeland Security Committee member said the coup effort was a surprise.
Priebus and Manafort make the rounds ahead of the convention, and Kerry talks world events.
Cornell William Brooks called for a focus on racial profiling.
"I can’t even say one threat concerns us," Frank Jackson said.
"I'm not sitting here naively trusting what the Russians may or may not do."
Hillary Clinton now leads Donald Trump in a CNN poll, 49 to 42 percent.
Priebus said Trump and Pence are "somewhere in the middle of each other."
"I think people are feeling pretty comfortable right now with what's happening," he said.
"There was never any doubt on Thursday," Paul Manafort said.
Clinton held a 12-point lead in the ABC News/Washington Post poll in June.
A new poll found 63 percent said race relations are generally bad.
Alfonse D'Amato predicted that "hooligans" will cause chaos at the convention.
Trump said he doesn't think Pence should adopt attacks like the "Crooked Hillary" nickname.
The DHS secretary praised the work of police officers serving their communities.
"That's anti-American and it's racist."