Donald Trump speaks at a campaign rally (Chris Carlson/AP)
Former president Donald Trump has continued his march towards the Republican nomination by winning the Missouri caucuses and sweeping the delegate haul at a party convention in Michigan.
Nikki Haley, the former UN ambassador who is his last major rival, was still searching for her first win.
The next event on the Republican calendar is Sunday in the District of Columbia.
Two days later is Super Tuesday, when 16 states will hold primaries on what will be the largest day of voting of the year outside the November election. Mr Trump is on track to lock up the nomination days later.
Nikki Haley is facing defeat (Chuck Burton/AP)
The steep odds facing Ms Haley were on display in Columbia, Missouri, where Republicans gathered at a church to caucus.
Supporter Seth Christensen stood on stage and called on them to vote for Ms Haley but was not well received.
Another caucus-goer shouted out from the audience: “Are you a Republican?”
Ms Haley went on to win just 37 of the 263 Republicans in attendance in Boone County.
Michigan Republicans at their convention in Grand Rapids began allocating 39 of the state’s 55 presidential delegates. Mr Trump won all 39 delegates allocated.
Trump takes another step towards nomination after Missouri and Michigan wins
