Trump's Covid-19 diagnosis fuels uncertainty for volatile US stock market

Should uncertainty persist, technology and momentum stocks that have led this year's rally may be particularly vulnerable to a selloff, some investors said

Investors are gauging how a potential deterioration in President Donald Trump's health could impact asset prices in coming weeks, as the U.S. leader remains hospitalized after being diagnosed with Covid-19.

So far, markets have been comparatively sanguine: hopes of a breakthrough in talks among U.S. lawmakers on another stimulus package took the edge off a stock market selloff on Friday, with the S&P 500 losing less than 1% and so-called safe-haven assets seeing limited demand. News of Trump's hospitalization at a military medical center outside Washington, where he remained on Saturday, came after trading ended on Friday.

Many investors are concerned, however,