The Government have been accused of cutting nearly £90million from the UK border security budget.
Shadow home secretary Andy Burnham claimed Border Force staff were told to anticipate 6% reductions this year and next – a total of £88 million.
He wrote to Home Secretary Theresa May, warning it is the “worst possible time” to squeeze spending and criticising the “highly unusual” failure.
But Mr Burnham said: “This is not good enough.
“This decision is yet another consequence of George Osborne’s botched Spending Review and Budget. “It has nothing to do with the EU Referendum and everything to do with a Government with its priorities wrong and whose austerity drive is putting our country at risk.”
In his letter he said he was “worried you are about to make a very serious mistake with respect to the resourcing of UK border security.
“It is my strong view that, in the wake of the terrible events in Brussels and Paris, this is the worst possible time to be cutting UK border security.
“As we learn more about the extent of the terror networks in Belgium, there will be increasing focus on the UK-Belgium border and whether security is strong enough across all air, sea and rail terminals.
“Now is the time to be strengthening our borders, not weakening them. I urge you to drop these damaging cuts.”