Washington, May 28 -- US President Donald Trump doubled down on his attacks against Harvard University by suggesting that the institution cap the number of foreign students it admits at 15 per cent.

In a fiery remark against Harvard University, Trump suggested that many foreign nationals admitted by Harvard are "troublemakers", disrupting the country. "We don't want to see shopping centres explode. We don't want to see the kind of riots that you had," he added.

Stating that Harvard University admits almost 31 percent of foreign students which some are from "areas of the world that are very radicalised", Trump said, "Why would 31 percent? Why would a number be so big? I think they (Harvard University) should have a cap of maybe around 15...