Knight Vinke Asset Management has called for UBS (NYSE:UBS) to divest itself of its investment banking business, saying it is too risky and threatens the core of the business.

In the video below, Fool financial analysts Matt Koppenheffer and David Hanson discuss UBS and how it was one of the hardest-hit banks internationally by the credit crisis, but Matt also tells investors how the teamwork between traditional banking and investment banking within a bank can also add strength to a bank. Matt and David discuss whether this teamwork makes UBS's investment banking unit worth the risk.