Asked whether he wanted to lower immigration levels, Ed Miliband said "I do want to get low skills immigration down," which would contribute to overall numbers.
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The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.
Boris Johnson and Amber Rudd have both criticised social media giants for failing to detect and remove extremist material online.