The UK government is in a face-off with the House of Lords over its contentious migration bill

FILE - A man thought to be a migrant who made the crossing from France disembarks after being picked up in the Channel by a British border force vessel in Dover, south east England, Friday, Aug. 13, 2021. The U.K. government watered down some parts of its controversial immigration legislation on Tuesday in a bid to get the bill through Parliament. The Illegal Migration Bill, once passed, would require officials to detain and deport people who cross the English Channel to Britain in small boats. (AP Photo/Matt Dunham, File)

LONDON (AP) 鈥 The U.K. government watered down some parts of its controversial immigration legislation on Tuesday in a bid to get the bill through Parliament, but stuck by other measures, setting off a new tussle with opponents.

The Illegal Migration Bill, once passed, would require officials to detain and deport people who cross the English Channel to Britain in small boats

The Conservative government has pledged to 鈥渟top the boats鈥 鈥 a reference to the overcrowded dinghies and other small craft that cross from northern France carrying migrants who hope to live in the U.K. More than 45,000 people arrived in Britain by crossing the Channel in this way in 2022; several died in the attempt.

The bill has been approved by the House of Commons, where the governing Conservatives have a majority, but faced strong opposition in the unelected House of Lords, which has the power to amend but not block legislation.

The Lords sent the bill back to the House of Commons with 20 amendments removing some of its most severe measures.

The government made some concessions to opponents, taking out a clause that would have made deportation apply to people who arrived even before the bill became law. The government also reduced the time unaccompanied minors can be held in immigration detention from 28 to eight days.

But the Commons rejected most of the Lords' changes, returning the bill to the upper house in a process known as 鈥減arliamentary ping-pong鈥 that could drag on for several days until one side backs down.

Immigration Minister Robert Jenrick said the Lords should 鈥渢hink again鈥 and respect the will of elected lawmakers.

鈥淚t鈥檚 vital that this bill reaches the statute book quickly, and in a form that will stop the boats,鈥 he said.

The legislation bars asylum claims by anyone who reaches the U.K. by unauthorized means, compelling officials to detain and then deport refugees and migrants 鈥渢o their home country or a safe third country,鈥 . Once deported, they would be banned from ever re-entering the U.K.

Britain鈥檚 government says the law will deter people from making perilous journeys across the Channel and break the business model of the criminal gangs behind the trips.

Critics say it would leave most refugees and victims of modern slavery with no way of seeking asylum in Britain and breaches the U.K.鈥檚 international human rights obligations.

Even if it is passed into law, the deportation plan faces serious obstacles. The U.K. and Rwanda signed a deal last year for asylum-seekers to be sent permanently from Britain to the East African country, but last month The government is seeking to appeal to the U.K. Supreme Court.

The immigration spokesman for the opposition Labour Party, Stephen Kinnock, said the bill was 鈥渁 tawdry and deeply counterproductive attempt to show the government is doing something, anything鈥 about a system that is overburdened by a backlog of thousands of asylum-seekers waiting months or years to have their cases heard.

鈥淭his bill will only make a terrible situation worse,鈥 he said.

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