Funding U.S.-Mexico Border Barrier Construction: Current Issues [Updated April 7, 2021] [open pdf - 732KB]
From the Document: "The construction of barriers on the U.S.-Mexico border to control unauthorized crossings has been a matter of significant debate since former President Donald Trump made construction of a border wall a key element of his campaign. This Insight provides a brief overview of the funding history for these barriers. On January 20, President Joe Biden issued a proclamation directing agencies to pause additional construction and obligation of funds pending collection of information and development of a plan to redirect some of the resources that had been dedicated to barrier construction, consistent with applicable appropriations law."
CRS Insight, IN11193
Congressional Research Service: https://crsreports.congress.gov/