New York — Investors are increasingly preparing for the risk of a contested US presidential election come November, worried that an ugly political situation will create volatility across markets.

A key risk is that Republican President Donald Trump is already questioning the legitimacy of the election, analysts said. His Democratic challenger, former vice-president Joe Biden, currently has a nine percentage point advantage among likely voters and a significant advantage among voters who are undecided, according to a Reuters/Ipsos opinion poll...

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