Sterling inched lower against dollar on track for the eighth decline in a row, hovering near 14-month lows amid a relatively lull market due to lack of data releases from US or Britain.
As of 04:17 GMT, GBP/USD inched down 0.04% to 1.2753, with a session-low at 1.2724, and a high at 1.2791.
US President Donald Trump warned Canada in another tweet while lauding Mexico by saying: "Deal with Mexico is coming along nicely. Autoworkers and farmers must be taken care of or there will be no deal. New President of Mexico has been an absolute gentleman. Canada must wait. Their Tariffs and Trade Barriers are far too high. Will tax cars if we can’t make a deal!".
Trump has repeatedly blasted the NAFTA trade deal with Mexico and Canada, describing it as the worst in US history and blaming it for harming US farmers and workers.
UK data released last week showed industrial output rose 0.4% m/m in June according to data released by the Office for National Statistics, the first such increase in three months, and compared to a 0.4% drop in May.
Manufacturing production rose 0.4% m/m in June according to data released by the Office for National Statistics, similar to the May's reading and edging estimates of a 0.3% expansion.
The pound is facing increasing pressures as the chances of an unorganized Brexit increase as negotiations with the European Union fail to reach a middle ground.