House Speaker John Boehner is traveling to California this week, where he'll help openly gay House candidate Carl DeMaio raise cash.

According to The Hill, Boehner will appear at a private event for DeMaio in San Diego on Saturday.

In 2012, Boehner raised eyebrows when he campaigned for Massachusetts Republican Richard Tisei, who is also openly gay. Boehner this year reiterated his support for Tisei, who is on his second attempt to win a House seat.

Last month, three prominent groups opposed to gay marriage targeted both campaigns as well as a third Republican candidate, Monica Wehby, who is looking to unseat Oregon Senator Jeff Merkley. Wehby highlighted her support for marriage equality in a television ad, making her the first Republican Senate candidate to run such an ad.

(Related: GOP Senate candidate Monica Wehby endorses gay marriage in new ad.)

The National Organization for Marriage (NOM), FRC Action and CitizenLink called on GOP leaders to distance themselves from the three candidates.

“It is extremely disappointing to see Republican leaders in Washington help push the election of candidates who reject the party's principled positions on these and other core issues,” Brown said.

The groups pledged in a letter to top Republicans to “mount a concerted effort to urge voters to refuse to cast ballots for [the candidates] in the November election.”

While open about his sexuality, DeMaio has faced criticism in the past over placing a low priority on issues related to gay rights. Tisei, who is married, said in March that he skipped the GOP's annual state convention over its opposition to marriage equality.