Sen. Jeff Sessions, R-Ala., estimated the cost at roughly $3.2 million per mile, more than $900 million for 300 miles. He said the fence would send "a signal that open-border days are over."
But Sen. Edward Kennedy, D-Mass., said the cost would be much higher, while Sen. Dick Durbin, D-Ill., predicted the fencing would be a "down payment" on a fence stretching the length of the border.
All Republicans and more than half the Senate's Democrats supported the proposal.
The bill is S. 2611.
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