A bipartisan group of senators that claims it has the support of President Donald Trump is backing legislation to revive the Glass-Steagall Act, a piece of 1930s legislation that prohibited commercial banks from engaging in investment banking activities.

The law was repealed in 1999, and some blame that repeal for the financial crisis that erupted in 2008 and 2009.

Sens. Elizabeth Warren, D-Mass., and John McCain, R-Ariz., said last week they were teaming with Maria Cantwell, D-Wash., and Angus King, I-Maine, to reintroduce a bill that would “reduce risks to the financial system by limiting banks’ ability to engage in certain risky activities and limiting conflicts of interest.”

Warren and McCain, who together had introduced a version of Glass-Steagall in 2013, said they are trying again because big banks pose a threat to the economy.

“Despite the progress since 2008, the biggest banks continue to threaten our economy,” Warren said in a statement. “For fifty years, the original Glass-Steagall Act helped produce broad-based economic growth and avoid any major financial crisis. The 21st Century Glass-Steagall Act will re-establish the wall between commercial and investment banking and make our financial system more stable and secure.”