The Advocate, a prominent magazine for the LGBT community, on Monday endorsed Hillary ClintonHillary Rodham Clinton'West Wing' star: Trump will 'do anything to delegitimize the press' Former Clinton spokesman: Virginia elections will begin resistance to Trump Scarborough: Missed opportunities in Trump’s inauguration speech MORE for president.
The magazine's latest cover includes an image of Clinton, the presumptive Democratic nominee, with the hashtag "#winner."
"She has produced the most complete and impressive LGBT platform of any presidential candidate ever," the magazine stated.
The endorsement comes as Democrats kick off their national nominating convention Monday in Philadelphia.
The magazine endorsed President Obama for reelection in 2012. But before that year, it noted, no previous candidate had backed same-sex marriage.
The publication also criticized Republican presidential nominee Donald TrumpDonald TrumpRubio to vote for Tillerson WSJ editorial: Trump looks 'small and insecure' Trump vows to cut taxes for businesses MORE, saying he "has indicated his eagerness to abandon civil rights in pursuit of an electoral win."
The Advocate went after Trump's selection of Indiana Gov. Mike PenceMike (Michael) Richard PenceWeek ahead: Trump takes on ObamaCare Trump: ‘We're not here to help ourselves’ Trump: ‘We’re going to start renegotiating NAFTA’ MORE (R) as his running mate. Pence caught flak last year over a state law that critics said would allow businesses to discriminate against LGBT customers.
Trump's selection of Pence as his running mate "underscores Trump’s abject refutation of LGBT rights as a principle he considers with any seriousness," the magazine argued.
Trump has received a mixed response for his pitch to members of the LGBT community following the massacre at a gay nightclub in Orlando, Fla., last month.
He also made an appeal to the LGBT community in his speech at the GOP convention last week, vowing to protect them from terrorism.
Clinton earlier this year won the backing of the LGBT advocacy group Human Rights Campaign.