United States President Donald Trump on Friday dramatically ramped up the application fee for companies hiring employees on H-1B worker visas , the principal mechanism for firms to bring in workers with specialised skills from around the world in fields ranging from technology to teaching.

The increase, to $100,000 per application, is meant to deter companies from using the programme to bring in foreign workers at current levels, amid a growing and heated debate within the US on immigration.

However, the hike in fees has also led to confusion, set off worries over its effect on the US tech sector, and raised questions about who really gained from H-1B visas, how that has changed over the years, and who might lose out most with the revised rules.

What has the Trump administration ann

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