The New York State attorney general's office filed a civil lawsuit on Saturday accusing Trump University, Donald J. Trump's for-profit investment school, of engaging in illegal business practices.
The lawsuit, which seeks restitution of at least $40 million, accused Mr. Trump, the Trump Organization and others involved with the school of running it as an unlicensed educational institution from 2005 to 2011 and making false claims about its classes in what was described as "an elaborate bait-and-switch."
In a statement, Eric T. Schneiderman, the attorney general, said Mr. Trump appeared in advertisements for the school making "false promises" to persuade more than 5,000 people around the country — including 600 New Yorkers — "to spend tens of thousands of dollars they couldn't afford for lessons they never got."
The advertisements claimed, for instance, that Mr. Trump had handpicked instructors to teach students "a systematic method for investing in real estate." But according to the lawsuit, Mr. Trump had not chosen even a single instructor at the school and had not created the curriculum for any of its courses.