The Labour leader will not say whether he wants the number of people coming into the UK to rise or fall.
Record numbers in England are on hospital waiting lists, while A&E delays highest since target introduced.
"Manipulative" Stephen Waterson will serve more than seven years after he crushed the three-year-old.
Up to 15 people are feared injured in the crash near a village in Cambridgeshire.
The drugs are said to have been sold to bodybuilders, gym goers and possibly professional athletes.