"It's nothing I didn't already know," Matt R. Salmon said, according to The Washington Blade

Over the weekend Rep. Salmon said he opposed same-sex marriage despite his son's sexuality. In March, Sen. Rob PortmanRobert (Rob) Jones PortmanTrump slaps tariffs on imported washing machines, solar panel technology GOP sees omens of a Dem wave in Wisconsin Flake's anti-Trump speech will make a lot of noise, but not much sense MORE (R-Ohio) announced his support for same-sex marriage. Portman cited his gay son in explaining why he changed positions.

"People seem to be trying so hard to analyze where it’s coming from, but really he was quite straight-forward," Salmon said of his father's opposition. "My father loves me very much and he supports me and he respects me. He’s very much there for me as one of my closest friends. I think that was obvious in everything that he had to say."

Rep. Salmon 's opposition does not mean that he does not think people should be with who they love, the younger Salmon said.

"He doesn’t see it as not allowing his son to be with the person he loves because he knows that regardless of where marriage is, I’m going to be with the person that I love," he added.

Salmon continued that his father's opposition centers on the definition of marriage.

"As far as it goes with marriage for him it’s a matter of what marriage means to him — to him marriage is defined as between a man and a woman," Salmon said. "It has nothing to do with the way he views a person’s relationship, and that’s the thing that I think is hard for people to understand."

In recent weeks, a number of senators have spoke in in favor of same-sex marriage. Portman and Sen. Mark KirkMark KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (Ill.) are the only two Republicans to voice support.

Democratic senators Jay RockefellerJohn (Jay) Davison RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers MORE (W.Va.), Mark WarnerMark Robert WarnerMissing text messages inflame Republican anger at the FBI Congress needs bipartisanship to fully investigate Russian influence Senator using 'talking stick' breaks Collins' glass elephant during shutdown talks: reports MORE (Va.), Bob CaseyRobert (Bob) Patrick CaseyDems sour on shutdown tactics AFL-CIO president: Trump has been a 'disappointment'  RNC launches effort against red-state Dems over shutdown MORE Jr. (Pa.), Kay HaganKay Ruthven HaganPolitics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 MORE (N.C.), Claire McCaskillClaire Conner McCaskillBudowsky: A hard lesson for Dems Senators get classified briefing on America's nuclear arsenal Senate moderates see influence grow after shutdown fight MORE (Mo.), Mark BegichMark Peter BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (Alaska) and Jon TesterJonathan (Jon) TesterDems sour on shutdown tactics Schumer comes under fire over funding deal Nerves fray as shutdown talks at impasse MORE (Mont.) also have announced their support.