Wall Street heavyweights are questioning the safety of government bonds. What does that mean for investors?

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• Investors have been antsy about the state of the US bond market.
• Concerns over the safety of government bonds have jumped amid the trade war and a US debt downgrade.
• Bonds may no longer be the "shock absorbers" investors can rely on in times of volatility, KKR said.

It's been a wild few months for the bond market, and the roller coaster has some Wall Street titans casting doubt on the safe-haven status of US government bonds.

Jitters...