Personally, given that the two largest Islamic fundamentalist enclaves (that means centers for the extremists) outside of the Muslim world are in Canada, that we already know those centers played a part in 9/11 and one of their folks was caught trying to bring a car load of explosives into the U.S., I'm actually more concerned with the northern border.
Unlike the southern border, much of the northern border includes vast tracks of forests, lakes, rivers, mountain ranges and the Great Lakes which are harder to observe then the southwest.
Then we disagree on how to repair the damn.
I don't advocate sticking a finger in a tiny crack while watching the town flood from the gaping hole.