Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE on Wednesday said it is important for President Trump's proposed wall along the southern border to move quickly to ensure border security.

“[The] border wall needs to move rapidly. It will be the final affirmation that the illegality is over," Sessions said during an interview on Fox News.

"It will multiply many times the effectiveness of our border. When you have fewer people enter, then you have fewer people to detain, fewer people to lock up, fewer people bringing in human beings, fewer people bringing in drugs."

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Sessions said there are many advantages to securing the country's border.

"Right now, they are hearing the Trump message. The numbers have dropped significantly, but if we don’t follow through and back up what he promised, then I think we could see these numbers rise again," Sessions said.

"We do not want that to happen.”

The attorney general said Trump has sent a "clear message" to people about not entering the country illegally.

"[He] said, ‘Please don’t come to our country unlawfully, apply properly and wait your turn.' That’s what a legal system is about. He’s committed to that," Sessions said.

"I believe we can continue to keep these numbers down and restore lawfulness. It’s not impossible. It’s something we can do and we must do.”

The president's proposed wall along the country's southern border could cost more than three times an initial estimate, according to Senate Democrats.

The U.S.-Mexico border wall could cost $66.9 billion, in addition to roughly $150 million in annual maintenance, according to a report released Tuesday by the Democratic staff on the Senate Homeland Security and Governmental Affairs Committee.