“That is a legitimate issue for us to look at,” Scott Walker said.
Bush said Trump's immigration proposals would be too costly and impractical.
Biden is too much of an insider to challenge Sanders, according to New Gingrich.
“When people see the benefits of our reforms ... I think our numbers will go up," Walker said.
“I'm talking about enforcing the laws of this country," Walker said.
The Louisiana governor said the last 10 years have shown Americans' resilience.
"It just seems to be one scandal after another,” he said.
Julian Hattem 08/30/15 10:16 AM EDT
“I think we have to use drones very, very selectively," he said.
Michael Needham said outsiders are in touch with "conservative populist primary voters.”
“I do not accept the fact that I have been weak on this issue," he said.