U.S. Senate rivals Patrick Murphy and Marco Rubio will face off in a Spanish-language debate in Miami, after Murphy's campaign confirmed Wednesday that he had accepted an invitation from Univision.

Rubio's campaign had previously accepted the TV network's invitation in September. No date has yet been set for the debate, the third the candidates have agreed to put on the calendar before Florida voters go to the polls Nov. 8.

"The timing worked out with Univision, we have been in touch with them and others for weeks now… so I'm looking forward to that," Murphy said.

The first debate between the two is scheduled for Monday night in Orlando.

Murphy was in Orlando for a news conference showcasing his support from gun-control advocates, including U.S. House candidate Val Demings, Connecticut Sen. Chris Murphy and the Pride Fund to End Gun Violence

"Patrick Murphy firmly stands with the majority of Floridians and American families in support of reasonable, common-sense gun violence prevention measures," Demings said.

The Pride Fund was formed in the wake of the mass shooting at Pulse nightclub, to support pro-LGBT candidates for national office who favor reforming the nation's gun laws. The political action committee has endorsed Murphy and Demings.

Its executive director, Jason Lindsay, on Wednesday harshly criticized Rubio, who he said failed to act after the massacre in Orlando.

"The Pride Fund has a very specific and important message for Marco Rubio today, and for all the other hypocritical politicians who stand by the gun lobby instead of the safety of the American people: You are fired," Lindsay said.

Murphy highlighted measures he supports which Rubio has opposed, including expanded background checks, an assault weapons ban and prohibiting people on the federal "No Fly" list from purchasing guns.

"The things that we are talking about doing are common sense," Murphy said. "These are things that the vast majority of Floridians support [and] the vast majority of gun owners support."

He also criticized Rubio's continued support of embattled Republican presidential nominee Donald Trump, who was in Ocala for a rally. Recent polls have shown Democratic nominee Hillary Clinton leading in Florida, with Rubio holding off Murphy.

In a statement, Rubio spokeswoman Olivia Perez-Cubas said Murphy's acceptance of Univision's invitation shows the Jupiter Democrat is "finally discovering that Florida has a Hispanic community."

"We're glad Murphy is finally accepting this debate we agreed to a month ago, so that Marco can contrast his long record of accomplishments on behalf of all Floridians with Murphy's record of ineffectiveness and dishonesty," Perez-Cubas said.

Murphy's campaign manager Josh Wolf charged that Rubio had "abandoned" Florida's Hispanic communities.

"Patrick will show up and fight for Florida's Hispanic families every day in the U.S. Senate and that difference will be on full display at the Univision debate," Wolf said.

jeweiner@orlandosentinel.com or 407-420-5171