When Donald Trump challenges the bond market, it is not just a political confrontation: it is a systemic shock. The American president, driven by an interventionist economic vision, has triggered a wave of instability by upsetting the balances of interest rates and Treasury bonds. Opposing him is a relentless market that did not take long to react. This showdown, far from being anecdotal, reveals the fragilities of a strained economy and revives the debate on the reliability of traditional assets in times of uncertainty.