Article snippet: report earlier this month by CBS News, about $558 billion in goods flowed across the border in both directions last year. It found that the U.S. exported $243.3 billion in goods across the border along with $58 billion in services. Nearly a half million people enter the US. each day at various entry points on the southern border, according to a Wilson Center report cited by CBS. Duncan Wood, director of the Wilson Center's Mexico Institute, told CBS MoneyWatch that shutting down the border would cost "hundreds of millions of dollars a day" or "maybe a billion." Trump also said that closing the border would help the U.S. auto industry. He concluded his string of tweets by accusing “Honduras, Guatemala and El Salvador” of taking money from the U.S. and threatening to cut off aid to the countries. Congress appropriates money for foreign aid and would have to sign off on reducing aid to the countries through the appropriations process, something unlikely to happen with Democrats retaking the House majority in January. Trump negotiated changes to the NAFTA trade deal with Canada and Mexico, but he must get the Congress to agree to legislation implementing the new trade rules to enact them. Democrats are demanding changes to the new deal that would strengthen labor rights provisions. On the shutdown, Trump and Democrats in Congress have been battling over who is to blame, with the White House stepping up its efforts to shift blame to Democrats. Democrats are con... Link to the full article to read more