“The battle got so testy that Senator Tom Harkin, the Iowa Democrat who has led Congressional hearings into the colleges, got into a heated exchange with Avy Stein, the Education Corporation investor.

The senator said that during a hallway conversation after lunch in the Senate dining room, Mr. Stein promised to “make life rough for me” if Mr. Harkin kept up his attacks.

“I took it as a threat — it was one of the most blatant comments ever made to me in my years in the Senate,” Mr. Harkin said.”

Read the full article at the New York Times here.