The UK is currently following EU asylum law during its 11-month post-Brexit transition period following its departure from the bloc in January.
This includes the so-called Dublin regulation, which states that a person’s asylum claim can be transferred to the first member state they entered.
The PM’s spokesman said the UK wanted to replace the “inflexible and rigid” regulation with a new agreement on returns after December.
He added that the current Dublin rules, which put a time limit on transfers, could be “abused by both migrants and their lawyers to frustrate the returns of those who have no right to be here”.
In a letter to Home Secretary Priti Patel on Monday, 23 Tory MPs and two peers said the UK should refuse to sign up to a “similar agreement” to Dublin after December.
The group said ministers should do “whatever it takes” to deal with the problem, saying many of their constituents were angry that migrants had been put up in “expensive hotels” and given “immediate access” to financial support.