The proposal by Customs and Border Protection calls for 505 kilometres of additional barrier by September 2027.
The Wall Street Journal was the first to report the plan, which would include 316 miles of new fencing and 407 miles of reinforcing existing fence over the next decade.
Mr. President, build The Wall!
His administration asked for $1.6 billion this year to build or replace 74 miles (118 kilometers) of fencing in Texas and California, and officials have said they also will seek $1.6 billion next year.
The Department of Homeland Security (DHS) prepared the document for several Senators who requested a detailed ask regarding the administration's border wall plans.
Chelsea boss Conte 'disappointed' after Norwich stalemate
They defended very well, showed they were well organised. "It was a pity, but [we had] great commitment from our players". Sometimes we lost our order, our combination play, but I think in the second half we did better.
"What the American people do want, in overwhelming numbers, is to provide legal protection to 800,000 Dreamers and a path toward citizenship for them", he continued, referring to a common name for young immigrants who came to the USA illegally as children. Although DACA expires in early March under Trump's order, for technical reasons advocates and legal experts see late January as a critical juncture for Congress to address the status of 'dreamers'. Jeff Flake, said Jason Samuels, a spokesman for the Arizona Republican. He said that the administration was undercutting bipartisan efforts to help those protected by DACA with the $18 billion request and other immigration demands.
The Democrats want to make DACA the focus of January's negotiations around funding the government, and Trump sees this as the flawless moment to throw in his border wall gambit.
Mexico has steadfastly rejected President Trump's demand that Mexico pay for the wall and few doubt that U.S. taxpayers will foot the bill - if the wall ends up being built. The $18 billion would expand the physical barrier on the US-Mexico border from its current 654 miles to almost 1,000 miles-about half of the total border.
FILE - In this November 9, 2016 file photo, a Border Patrol vehicle drives by the border fence in Tecate, Calif., left, along the metal barrier that lines the border, seen from Tecate, Mexico.