Updates
** Shares of buy now, pay later firms fall after initial gains following U.S. President Donald Trump's calls for one-year cap on credit card interest rates at 10%, starting January 20
** Some analysts say imposing a cap on interest rates will require legislation and can exceed the president's authority, casting doubts on whether the policy will materialize
** Investors say the proposal can push borrowers away from traditional credit cards and toward alternative lenders, including BNPL providers
** Klarna KLAR.N falls 4.2%, Affirm AFRM.O sheds 6.9%
** Sezzle SEZL.O slips 2.2%
(Reporting by Pritam Biswas in Bengaluru)
((Pritam.Biswas@thomsonreuters.com))