Internet reports that the "sell-off of U.S. bonds" trade that swept the market earlier in April could deal a lasting blow to investors 'willingness to hold the U.S. government's longest-maturing bonds, the main pillar of the U.S. government's deficit financing vehicle. The problem for bond managers at BlackRock, Brandywin Global Investment Management and Vanguard Group is that as President Trump approaches 100 days in office, he is creating more and more unknowns, forcing traders to focus on a wide range of issues beyond the likely direction of interest rates. The result has led bond buyers to question the traditional safe haven status of U.S. government debt and demand higher yields on longer-term bonds.