JPMorgan CEO Jamie Dimon predicts a 'kerfuffle' in the US Treasury market and expects the Federal Reserve to step in.Yields, especially on longer-term debt, have increased amid market turmoil related to President Trump's tariff policy.Dimon suggests that bank rule changes are necessary to avoid a repeat of the Treasury market freeze seen in March 2020.He highlights the need for reforms to make banks more active intermediaries, otherwise, the Fed will have to intervene.