Less than a month after suing Twitter for allowing its users to insult him, Representative Devin Nunes, a Republican from California, said he was suing the McClatchy Company, a newspaper chain, over what he called “character assassination.”

The defamation lawsuit seeks $150 million and the deletion of an article in The Fresno Bee, a McClatchy newspaper, about Alpha Omega Winery, a company that Mr. Nunes partly owns. The article, published last May, described a lawsuit by a server who was aboard a San Francisco Bay cruise in 2015 that was attended by some of the winery’s top investors and that she said had included drugs and prostitution.

The article said it was “unclear” whether Mr. Nunes “was aware of the lawsuit or was affiliated with the fund-raiser” at which the cruise was auctioned.

The lawsuit filed by Mr. Nunes, a loyal ally of President Trump and a former chairman of the House Intelligence Committee, says that he was not involved in the incident on the yacht and that he considers the article part of a politically motivated scheme to “destroy his reputation” and derail the committee’s investigation into Russian interference in the 2016 presidential election.