Citibank warns that Trump's idea of setting a cap on credit card interest rates may lead to an economic slowdown.

Mark Mason, Chief Financial Officer of Citigroup, stated that the bank hopes to cooperate with Trump's agenda to increase payment capabilities, but does not support his proposal regarding a cap on credit card fees. Mason said during a conference call with reporters on Wednesday after Citigroup announced its fourth quarter financial report, "Interest rate caps are likely to lead to a significant economic slowdown." He added that affordability is an important issue Citigroup hopes to work with the government to address, but "frankly, we neither support nor have the ability to support the proposal for interest rate caps."