Donald Trump backs a Brexit
He said:
"I think the migration has been a horrible thing for Europe. A lot of that was pushed by the EU. I would say that they're better off without it personally, but I'm not making that as a recommendation - just my feeling … I would say that they're better off without it, but I want them to make their own decision."
Britain's vote to either remain or leave the EU on June 23.
Results from the polls have massively varied in outcome over the last few months, as the time to vote draws closer.
However, analysts have continuously pointed out that one of the key reasons for why a big chunk of Britons support a Brexit is due to the issue of immigration.
And the issue is two pronged.
Various polls over the last year or so have shown how the Freedom of Movement Act, which allows all EU citizens to easily migrate to any other member state, as well as immigration in general, is one of the factors that pushes UK voters to pip for exiting the EU.
After all, government data shows that net migration into Britain from the EU was 180,000 in the year to June 2015 - a new all-time high.
Freedom of Movement Act rules only apply to EU citizens - not asylum seekers, expats or economic migrants.
However, of the 3.2 million non-UK nationals working in Britain in the third quarter last year - just under 2 million were EU nationals.
Meanwhile, Europe is embroiled in the worst refugee crisis since World War II.
The United Nations refugee agency (UNHCR) confirmed on December 30, 2015, that more than one million refugees and migrants reached the continent by sea since the start of 2015. This is versus 219,000 in 2014.