When the horserace is expanded to four candidates - including Libertarian Gary Johnson and the Green Party's Jill Stein - Clinton gets support from 39 percent of voters, Trump gets 38 percent, Johnson 10 percent and Stein 6 percent.
The NBC/WSJ poll - conducted June 19-23 - comes after Clinton clinched the number of delegates needed to become the Democratic Party's presumptive nominee; after the tragic June 12 Orlando, Fla., shootings; and after a rough three-week stretch for Trump's campaign.
Despite these events and changes, the Clinton-vs.-Trump horserace remains relatively consistent.
Much like last month, Clinton leads Trump among African Americans (87 percent to 5 percent), Latinos (69 percent to 22 percent), those ages 18-34 (53 percent to 30 percent), women (52 percent to 35 percent).
Trump, meanwhile, has the edge among whites (49 percent to 37 percent), men (48 percent to 38 percent) and independents (40 percent to 30 percent).
Additionally, Clinton gets overwhelming support from Democrats (85 percent to 8 percent), and Trump gets similar - though slightly less - support from Republicans (79 percent to 9 percent).
The NBC/WSJ poll was conducted June 19-23 of 1,000 registered voters, including 450 cell phone-only respondents and another 50 reached by cell but who have a landline. The survey has a margin of error of plus-minus 3.1 percentage points.