The Trump administration is reviewing the records of more than 55 million US visa holders for potential revocation or deportable violations of immigration rules, in a significant expansion of Donald Trump’s immigration crackdown.

The state department said that all of the foreigners who now hold valid US visas are subject to “continuous vetting” for any indication that they could be ineligible for the document, including those already admitted into the country. Should such evidence come to light, the visa would be revoked and, if the visa holder were in the United States, they would be subject to deportation.

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