Hillary Clinton’s lead over Donald Trump has dwindled, according to a new national poll.

Clinton now leads the GOP nominee by just 42 to 39 percent in a Reuters/Ipsos poll taken from Sunday through Thursday and released Friday. The poll has a three percent margin of error.

Clinton led Trump by six points, 41 to 35 percent, a week ago in the same poll conducted during the week of the Democratic convention.

It is unclear why Clinton’s advantage narrowed.

The poll was taken as Trump endured criticism for lashing out at a Gold Star military family.

Clinton maintains a 6.9 percentage-point lead over Trump, according to the RealClearPolitics average of several polls on Friday.