In a speech setting out measures to tighten immigration rules, Mr Cameron said people should report suspicions to Crimestoppers and the UK Border Agency.
BBC: David Cameron urges people to report illegal immigrants
Welsh Liberal Democrat housing spokesperson Peter Black said he was disappointed the Queen's Speech did not include measures to tackle homelessness.
Other measures in the speech included a paycheck fairness act intended to make it easier for women to fight salary discrimination without losing their jobs, and new proposals to develop alternative energy hubs in the country, and help people refinance their mortgages at today's lower interest rates.
Key measures outlined in the speech include a legal obligation to halve the budget deficit within four years and a promise to clamp down on bankers who take too many financial risks.
Mr Alexander added the measures in the Queen's Speech would "deliver real benefit for Scotland".
The opposition has called for measures in the Queen's Speech to help families with the cost of fuel bills and train fares.
BBC: David Cameron and Nick Clegg: No let-up in tough decisions
The Scottish government said it was now going ahead with another consultation to consider what extra measures are needed to guarantee freedom of speech, including the protection of religious beliefs of teachers and parents in schools.
Gavin Brown, the finance spokesperson for the Scottish Conservatives, said while he approved of a number of the measures John Swinney had mentioned in his speech, there was still "a bit of a sense of complacency" in the Scottish government's response to the crisis and it was "not being treated as seriously" as it should be.
Others note that Mr Bush's speech also repeated his support for un-green measures such as his Clear Skies Initiative, a bill to regulate emissions from power plants that excludes carbon dioxide (the principal greenhouse gas responsible for global warming), and his energy bill, which strongly boosts coal and nuclear power and proposes opening up protected areas of Alaska to oil-drilling.
In a recent speech, Health Minister Ana Mato argued that the new measures relating to illegal immigrants' access to free public healthcare were "not driven by a desire to save money".
Mr Clegg wants to renew the reforming tradition of the old Liberal Party with ideas ranging from anti-sleaze measures (he was due to give a speech on money in politics on March 13th) to constitutional reform.
His speech also comes as Obama and some lawmakers focus on passing gun control measures.
The speech outlined a UK governmental programme dominated by anti-terror and crime measures, including the introduction of ID cards and an anti-terror bill.
In a televised speech on state media last week, al-Bashir urged citizens to understand the new harsh austerity measures, which lifted fuel subsidies and cut the Cabinet by half to reduce expenses.
Labour leader Ed Miliband said his party would support measures such as parental leave and a Green Investment Bank - but the Queen's Speech contained nothing for the young unemployed, working families and "millions of people who don't think the government is on their side".
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