“Certain things are said during the campaign that are not fully informed,” Kelly said.

“One thing is to campaign, another thing is to govern. It’s really hard,” he added later.

“A concrete wall from sea to shining sea” is not going to happen, Kelly said. Instead, “a physical barrier in many places” is what the administration is requesting. Kelly used the term “physical barrier” several times during the meeting, attendees said.

“Concrete wall is not a realistic solution in many places,” Kelly said — noting that topography, among other issues, makes building a physical wall difficult along certain parts of the more than 2,100 miles between the United States and Mexico.

Instead, “we need 700 more miles of barrier,” Kelly said — a concession that a physical barrier does not need to stretch the entire length of the border.