This is the best tl;dr I could make, original reduced by 85%. (I'm a bot)

> A new US-Canada border deal meant to halt the flow of asylum seekers at unofficial border crossings has taken effect.

> The original 2004 agreement, the Safe Third Country Act, requires migrants to make an asylum claim in the first "Safe" country they reach, whether it is the US or Canada.

> Mr Biden's administration has also proposed to crack down on asylum seekers at the US southern border with Mexico by making it harder for migrants to claim asylum once Covid border controls lift in May. The proposal has met backlash from human rights groups.

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