The U.S. Customs and Border Protection has $20 million for President Donald Trump's promised wall on the U.S.-Mexico border – enough to build about seven miles of a 1,000-mile structure, ProPublica reported Thursday.

The CBP's top contracting official, Mark Borkowski, gave the update on finances at a conference in San Antonio, ProPublica reported.

The money the agency has – falling far short of the estimated $20-billion-plus cost – will go instead to eight model walls, planning, engineering, and early stage land acquisition, ProPublica reported.

Borkowski added the wall will ultimately require two years before its construction should begin once available funding exists, ProPublica reported.

Trump asked for $2.6 billion for his wall in his federal budget blueprint last month, adding he also wants $1.5 billion he requested for it in a supplemental spending measure for 2017.

GOP leaders are expected to exclude the money in the spending bill being prepared to keep the federal government open beyond April 28.