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Suella Braverman has refused to commit to a date for achieving the government's aim of stopping small migrant boats crossing the Channel.
The home secretary told the BBC she wanted to deliver on the pledge as quickly as possible.
But she admitted the government was facing an ongoing legal challenge over its Rwanda plan, and that it could not control court timeframes.
The PM has said stopping migrant crossings is one of his top priorities.
Ms Braverman told the BBC's Sunday with Laura Kuenssberg programme: "The prime minister's made the key pledge to stop the boats, it's going to be pretty obvious when we've succeeded in achieving that.
"I'm not going to put clear dates on everything."
Under the government's plans, people who arrive in the UK through illegal routes could be sent to Rwanda on a one-way ticket to claim asylum there.
In December the High Court ruled the plan was legal, but the decision is currently going through an appeals process.