Key insights : Mastercard's earnings beat analyst expectations. : Mastercard's earnings beat analyst expectations. What's at stake : CEO Michael Miebach expressed opposition to the Credit Card Competition Act and concern about a potential 10% credit card interest rate cap. : CEO Michael Miebach expressed opposition to the Credit Card Competition Act and concern about a potential 10% credit card interest rate cap. Processing ContentPresident Trump has threatened to impose a one-year, 10% cap on credit card interest rates while endorsing the Credit Card Competition Act .