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
Two police officers face a gross misconduct hearing after stopping at McDonald's before attending an emergency call for a suicidal woman.
International Development Secretary, Priti Patel, urged the rest of the world to 'act now' to help millions of people at risk of starvation.
Nail-biting footage of two thrill seekers climbing to the top of One Canada Square in London's Canary Wharf has emerged online.