A new national poll shows Democratic front-runner Hillary Clinton with a slight lead over presumptive Republican nominee Donald Trump.

In a Quinnipiac University poll released today, 45 percent of voters said they would vote for Clinton, while 41 percent favor Trump.

Men and women are divided over Clinton and Trump, with men preferring Trump over Clinton, 51 to 35 percent. Women go for Clinton over Trump, 54 to 30 percent.

Clinton loses to Trump among white voters by 17 points; Trump pulls in 50 percent of support among white voters, while Clinton gets 33 percent. Black voters choose Clinton over Trump, 93 to 4 percent, and Hispanic voters also pick Clinton over Trump, 65 to 18 percent.

When a third-party candidate is factored in, it becomes a tighter race. Clinton receives 40 percent, with Trump at 38 percent. Gary Johnson, a former New Mexico governor who recently locked up the Libertarian Party nomination, gets 5 percent, while Green Party candidate Jill Stein gets 3 percent.

In a match-up against Trump, Democratic candidate Bernie Sanders beats the business mogul, 48 to 39 percent. But Clinton is the preferred candidate among Democratic voters to be their party's nominee. The Vermont senator garners 39 percent of support among Democratic voters for the nomination, behind Clinton's 53 percent.

Fifty percent of voters don't view Trump's withholding of his tax returns as a legitimate issue in this election, but 46 percent believe it is.

In more lighthearted questions, voters were asked whom they would rather invite to a barbecue and whom they'd rather watch on their TV for the next four years. Forty-four percent of voters said they'd rather watch Trump on TV, while 41 percent of voters would rather see Clinton. And 47 percent of voters are more inclined to invite Trump to a backyard barbecue; 39 percent of voters would invite Clinton.

ABC News' Ryan Struyk contributed to this report.