Mexican President Enrique Peña Nieto, after Peña Nieto reiterated that Mexico would not pay for it.

On Thursday, Senate leader Mitch McConnell, R-Ky, said Congress will follow through on Trump’s border wall order, and McConnell estimated it will cost $15 billion at most — he cited a range of $12 billion to $15 billion. 

The U.S. border with Mexico is roughly 2,000 miles long and underlines four states, from California to Texas, more than half of it along the Colorado River and Rio Grande. It is a massive stretch of land — the Berlin Wall spanned just 96 miles comparatively, and it cost about $25 million to build in 1961, or around $200 million with inflation.


The CBO Said It Cost $1.76 Trillion. In March 2012, the CBO updated its Obamacare cost estimate to $1.76 trillion. The Senate Budget Committee Minority Office reported that this was two times more than the CBO's original estimate of $940 billion.