Hillary Clinton's lead over Donald Trump in a general election matchup decreased slightly since late last week, according to a Reuters/Ipsos poll released Tuesday.

The poll, conducted from Friday to Tuesday, showed Clinton, the presumptive Democratic presidential nominee, with an 11.6-point advantage over Trump, her Republican counterpart. She held a 13-point lead in the previous five days, ending Saturday.

The survey was the first Reuters/Ipsos poll conducted since the Orlando mass shooting that left 49 people dead and many more injured on Sunday.

In response to the attack, Trump defended his plan to implement a temporary ban on Muslims entering the country, while Clinton said the country should not demonize and attack an entire religion, calling instead for stricter gun control.

The Reuters/Ipsos poll also found that the number of voters who said they would not vote for either party's presumptive nominee has increaseed in the past week. About 22.4 percent of likely voters said they would not support either candidate, according to the five-day average of results on Tuesday. The number rose from about 20.6 percent a week ago.

The online poll included 1,063 likely voters. The margin of error is 3.5 percentage points.

According to the RealClearPolitics average of polls, Clinton has a 5.5-point lead over Trump, 44.1 percent to 38.6 percent. According to a Bloomberg Politics poll conducted June 10–13, Clinton holds a 12-point lead over Trump.