Investment banks may be getting a lot smaller.

One of Trump’s top advisors has stunned markets by announcing that he would support enacting legislature that would force investment banks to split from their lending operations, thus ensuring “too big to fail” institutions do not produce an economic calamity like the 2007/2008 Global Financial Crisis.

Former-Goldman Sachs Group Inc. (GS) executive Gary Cohn has told legislators that he would like to enact a revised version of Glass-Steagall, a rule enforced by banking regulators that forced banks to keep their investing and lending operations separate by housing them under different firms. The segregation of these two activities theoretically protected both from contagion, in which a sudden loss in one of the banks would not result…