The legislation was the result of months of negotiations between a group of Republican and Democratic senators and the White House.
 
Bush, speaking on Thursday at a naval war college in Newport, expressed "disappointment" with the collapse of the bill and said the outcome was "unacceptable" to the American people.
 
Tougher measures
 
Bush has sought an overhaul of US immigration laws for years but the senate's rejection of the bill exposed divisions among his own party.
 
Republicans opposing the bill called it an amnesty for the US's estimated 12 million illegal immigrants, said it would do little to stem illegal immigration and rejected a promised $4.4bn to pay for more border security.
 
The bill tied tough border security and workplace enforcement measures to a plan to legalise illegal immigrants and create a temporary worker programme.
 
It would also have created a new merit-based system for future immigrants.
 
'Cheap labour'
 
Opponents of the bill said Bush should instead concentrate on keeping illegal immigrants out.
 
"The next step is to immediately push the president to take up his word and enforce security at the border," said senator David Vitter, a Louisiana Republican who voted against the bill.
 
Some labour unions also opposed the bill, saying its proposed temporary worker programme would have created an underclass of cheap labourers.
 
This was the second time in as many weeks that the Senate has tried to pass the legislation.