US presidential hopeful Donald Trump's support among Republicans has dropped 12 points in less than a week, marking the real estate mogul's biggest decline since he vaulted to the top of the field in July, according to a Reuters/Ipsos poll.
Mr Trump was the favourite of 31% of Republicans in a rolling poll in the five days ended on 27 November. That was down from a peak of 43% registered on 22 November.
The dip follows criticism of Mr Trump for comments he made in the aftermath of the 13 November Paris attacks that killed 130 people and wounded hundreds more.
Following the attacks, he told an NBC News reporter that he would support requiring all Muslims within the United States to be registered to a special database, which his critics have likened to the mandatory registration of Jews in Nazi Germany.
Mr Trump has also been criticised for flailing his arms and distorting his speech as he mocked a New York Times reporter, Serge Kovaleski, who is disabled.
He mocked the reporter as he defended his unsubstantiated assertion that during the 11 September 2001 attacks on the United States, he watched on television as "thousands and thousands" of people in New Jersey cheered while the World Trade Center fell.
Still, Mr Trump is not the only front-runner to slide in the latest survey.
Retired neurosurgeon Ben Carson has seen his poll numbers drift downward and now trails Trump by more than half, with just 15% of Republicans polled saying they would vote for him in the same 27 November poll. As recently as late October, Mr Carson trailed Mr Trump by only six points.
Following Mr Carson, Florida Senator Marco Rubio and Texas Senator Ted Cruz are tied for third place, with more than 8% each.
Following them was former Florida Governor Jeb Bush, with 7%.
The five-day rolling average sample size ranged from 464 to 347 respondents between 22 November and 27 November with a credibility interval of 5.2 to 6.1% points.
