US Presidential polls: Hillary Clinton wins Mississippi primary

Hillary Clinton has won the Democratic primary contest in Mississippi, US networks said on Tuesday, adding to a string of victories over her party rival Bernie Sanders.

The Republican White House nomination vote in the southern state was deemed too close to call right away, although CNN projected a win for the frontrunner Donald Trump.

Very early results were also coming in from northern Michigan -- the other big prize in Tuesday's contests where the bulk of polling places close an hour after Mississippi.

Early results suggested Trump was neck-and-neck with John Kasich in Michigan, while on the Democratic side Sanders was projected to have taken the lead over Clinton.

Republican voters also have their say Tuesday in a primary in Idaho and a caucus in Hawaii.