Immigration minister Damian Green said London Metropolitan University was "very, very deficient" sponsor because more than a quarter of students sampled were studying there when they did not have permission to stay in the country.
A "significant proportion" of students did not have a good standard of English and there was no proof that half of those sampled were turning up to lectures, he added.
"Any one of those breaches would be serious. We found all three of those breaches at London Metropolitan.
"I'm not chucking anyone out, we have actually set up a task force to make sure genuine students can stay in the country" he said.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants