Acting ICE Director: Illegal Border Crossings at 45-Year Low

'We Ought to Lock Them Up': GOP Rep Proposes Jailing Sanctuary City Officials

Department of Homeland Security Secretary Kirstjen Nielsen said new sections of a U.S.-Mexico border wall -- a pillar of President Trump's presidential campaign -- will be built, but the administration is still waiting for Congress to approve funding.

Nielsen spoke to Brian Kilmeade along the border at the Rio Grande Valley border patrol sector in Texas, where she hopes to add fortifications to what she called "the priority area."

"We've got to keep pressing Congress to get us that funding we requested in [fiscal year 2018]. ... It's gonna be a big two weeks," she said.

President Trump assured that the wall will be built at a swearing-in ceremony for Nielsen last week.

"If we don't get the wall, you're gonna have a lot of very unhappy people, starting with me," Trump said. "We're gonna get the wall."

Trump noted that illegal border crossings were at a 45-year low in the 2017 fiscal year, and he said he's confident that Nielsen will "take it to new levels."

Nielsen said that the term "wall" refers to more than just the physical barrier, explaining that the Trump administration is focused on a "system of systems," including more cameras and sensors and increased personnel.

She said not only are illegal immigrants looking for ways to bypass the U.S. Border Patrol, but it's criminal organizations, drug traffickers, human smugglers and potentially terrorists looking for easy passage.

According to the San Diego Union-Tribune, officials in California began last week testing border wall prototypes to see how easily someone could climb over the top or dig a hole underneath.

Watch the interview above.

Antonio Sabato Jr. on Kate Steinle Verdict: Liberals Are Destroying California

Clarke: Build the Wall or Illegal Immigrant Felons 'Will Keep Coming Back'

Sessions: Trump Doing Everything Possible to Reverse Sanctuary City Policies