As voters in Washington, D.C., set out to vote in Tuesday's Democratic primary, presumptive Democratic presidential nominee Hillary Clinton has already received some good news. Her lead has expanded in the likely general election matchup against presumptive Republican nominee Donald Trump.

That's according to a new weekly tracking poll released early Tuesday morning by NBC News/SurveyMonkey. The poll found Clinton was ahead 49 percent to 42 percent. The week before, the former secretary of state led Trump 48 percent to 44 percent. The latest figures from the NBC News poll came after a week in which Clinton locked up enough delegates to earn the nomination and Trump insulted federal Judge Gonzalo Curiel in comments many, including Republican leadership, have called racist.

Clinton also led in the poll when the race was expanded to a four-way competition that included Libertarian candidate Gary Johnson and Green Party candidate Jill Stein. Clinton earned 42 percent support, Trump 38 percent, Johnson 9 percent, and Stein 5 percent. 

Notably, Clinton narrowed the presumptive Republican nominee's lead in some key demographics: men and white voters. Among male voters, Trump's lead fell from 14 points to 9 points (51 percent to 42 percent) and among white voters, his 13-point lead shrunk to 9 points (50 percent to 41 percent). Among self-described moderate voters, Clinton expanded her lead by 7 points, opening up a margin of 58 percent to 33 percent.

The NBC News poll was conducted online from June 6 to June 12, and surveyed 10,604 adults, including 9,355 who are registered to vote, with a margin of error of plus or minus 1.4 percentage points.

Recent polls have uniformly shown Clinton ahead of Trump. The RealClearPolitics average of polls gives her a 4.5-point lead over the billionaire businessman.