Support in Britain for leaving the European Union has grown marginally, adding to recent data that showed the public leaning toward departing, according to a poll released Monday by The Guardian and ICM.
Fifty-three percent of respondents favored leaving the European Union, while 47 percent believed the United Kingdom should stay, the British newspaper said. Those results exclude undecided respondents. Two weeks ago, an ICM poll showed a 52-48 percent split between the leave and remain camps.
John Curtice, a professor at Strathclyde University, told the newspaper: "These results are consistent with the generality of numbers over the last couple of weeks, in which there has been some weakening in the remain position. It was already plain that this race was far closer than the prime minister intended, and he must now be feeling discomfort at the thought that the outcome really could be in doubt."
The Brexit referendum is scheduled for June 23.
The Guardian's report comes after The Independent released another poll on Friday showing a majority of British people in favor of leaving the European Union.
The data in the London paper showed that 55 percent believe Britain should leave the EU, versus 45 percent who favored staying. The publication said this marked the largest portion of respondents who favored exiting since research firm ORB began polling the issue for it last year.
— CNBC's Jacob Pramuk contributed to this report.