Republican presidential nominee Donald Trump has pulled nearly even with Democratic rival Hillary Clinton for the first time since May, according to a Reuters/Ipsos poll taken over the course of the Republican National Convention in Cleveland this week.

The July 18 to 22 national online poll found that 41 percent of likely voters supported Clinton, while 38 percent supported Trump. Given the poll's credibility interval of about 4 percentage points, Trump and Clinton should be considered to be about even in the race.

Just before Republicans opened the convention on Monday, Trump had trailed Clinton by nearly 10 percentage points in the poll.