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Sanders won unexpectedly in Michigan while Trump took Michigan and Mississippi
Republican Donald Trump has won two more states, Michigan and Mississippi, in his bid for the White House.
In the Democratic race, Bernie Sanders had a surprise victory in Michigan, but Hillary Clinton increased her lead with a big Mississippi win.
Ted Cruz has won the Republican-only Idaho contest. Hawaii is also voting.
The four states are the latest to choose their candidates from each party who will compete in November’s presidential election.
It was a terrible night for Republican Florida Senator Marco Rubio, who came in a distant fourth in both Michigan and Mississippi, days before his must-win contest in his home state.
Mr Trump, a businessman with no experience of elected office, leads the polls in Florida, from where he delivered his victory speech on Tuesday night.
“One of the things I am most happy about is the turnout has been just massive… I think it’s the single biggest story in politics today,” he said at a press conference in Jupiter.
Analysis – Nick Bryant, BBC News, Detroit, Michigan
With victories in Mississippi and Michigan, Donald Trump solidified his position as the Republican front-runner, withstanding a barrage of negative advertisements questioning everything from his business acumen to his use of vulgar and profane language.
Rather than deliver a conventional victory speech, the billionaire held a news conference and conducted what looked in parts like an infomercial, arguing that products that bear his name, like bottled water and wine, are commercial successes.
But it’s the Trump political brand that’s not only proving highly popular but also resilient to attacks from establishment Republicans who have intensified their attacks in the hope of slowing his momentum.
Showing how the normal political rules do not apply, Trump reckoned that one of the attack ads, bleeping out various swear words he’s uttered during the campaign, actually boosted him because it showed that he’s not bound by political correctness and tells it like it is.
He also said he would be more presidential than anybody except Abraham Lincoln and that “no one is more conservative than me”.
Ohio Governor John Kasich ended in second place in Michigan, which neighbours his home state. He is banking on a win in his home state when the Republicans vote in Ohio on 15 March.
The Democrat Mr Trump is most likely to face if he gets the Republican nomination, former US Secretary of State Hillary Clinton, addressed voters in Ohio after her Mississippi win.
“Running for president shouldn’t be about delivering insults,” said Mrs Clinton, in a thinly veiled dig at the outspoken Mr Trump.
“It should be about delivering results.”
BBC