Immigration minister Damian Green claims the UK Border Agency was in "complete chaos" when the coalition Government took office two years ago.
It is getting better slowly, probably too slowly than most people would want - some areas are getting better faster than other areas.
We're not stopping here and I'm not saying the system is perfect yet.
In the coming months, we will be changing immigration laws to cut the abuse of the Human Rights Act, which has been used by far too many people to delay the process of removal.
More top news
Ministers say the Great Repeal Bill will avoid a "black hole" in the UK's law when we leave the EU. Details are to be published on Thursday.
The triggering of Article 50 has dominated newspaper headlines on Thursday, with many focusing on a possible threat over security by Ms May.
Twelve people have been killed and three injured after a pick-up truck and a church minibus crashed head-on in Texas.