BORIS Johnson’s opponents have called on him to resign over his “reckless and irresponsible" comments on the Northern Irish border issue but the Foreign Secretary claimed a row was being stoked up artificially to frustrate Brexit.http://www.heraldscotland.com/news/16056394.Johnson_urged_to_go_over_his__quot_reckless_quot__comments_on_Northern_Irish_border_issue/