Republican Donald Trump looks to be the front-runner in the bid for a GOP presidential nomination with Super Tuesday wins in six states.
Meanwhile, Ted Cruz picked up victories in Texas, his home state, and Oklahoma.
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Super Tuesday marked the busiest day of the 2016 primaries, with the biggest single-day delegate haul up for grabs. With elections in every region of the country, the contests put a spotlight on candidates' strengths and weaknesses with a broad swath of American voters.
Republicans spent months largely letting Trump go unchallenged, wrongly assuming that his populist appeal with voters would fizzle. Instead, he's appeared to only grow stronger, winning states and drawing broad support for some of his most controversial proposals.
In six of the states on Tuesday, large majorities of Republican voters said they supported a proposal to temporarily ban all non-citizen Muslims from entering the United States, an idea championed by Trump. Two-thirds of GOP voters in Texas, Virginia and Georgia, 7 in 10 in Tennessee, and nearly 8 in 10 in Alabama supported the proposal, according to the early exit polls.
Worries among Republicans appeared to grow after Trump briefly refused to disavow former Ku Klux Klan leader David Duke during a television interview. Trump later said he had not understood the interviewer who first raised the question about Duke, and he did repudiate him.
House Speaker Paul Ryan said Tuesday that anyone who wants to be the Republican presidential nominee must reject any racist group or individual.
"When I see something that runs counter to who we are as a party and a country I will speak up. So today I want to be very clear about something: If a person wants to be the nominee of the Republican Party, there can be no evasion and no games," Ryan said.