Why does the government want to reform judicial review?

Tory ministers have long been unhappy with wide-ranging court powers to challenge the legality of their actions

• Leaked report suggests Dominic Raab trying to curb judges’ powers

The justice secretary, Dominic Raab, is planning to make it harder to succeed in judicial reviews against the government, a leaked document suggests. But what is judicial review and why is the government determined to reform it?