The Labour party has said that the resignation of Immigration Minister Mark Harper demonstrates the complexity of immigration checks for landlords and employers.
Mr Harper resigned after discovering that his cleaner was in Britain illegally, although Downing Street said there was nothing to suggest that he knowingly employed an illegal immigrant.
"This information about Mark Harper’s employee does put him in a difficult position," Mr Hanson said.
"Perhaps once again the government need to think very carefully about how they approach this issue, as it is clear there are limits to the effectiveness of relying on employer and landlord checks to address illegal immigration."
More top news
Mild in the south but colder in the north tonight and turning frosty and icy - before rain moves in.
The flame-haired prince told youngsters in Africa he did not enjoy Eton and is "much cooler" than his older brother.
Some Scottish social media users were left confused when Facebook offered them a Romanian flag, not a Saltire, to mark St Andrew's Day.