The Trump campaign filed a libel lawsuit against CNN on Friday for a column about the president and election help from Russia, the third such action against a news organisation taken in the past two weeks.

The campaign said a piece by Larry Noble posted last June on the CNN website falsely claims that the campaign considered seeking Russia's help in the 2020 campaign and "decided to leave that option on the table." It made the complaint in a lawsuit filed in the US District Court in Atlanta, where CNN is based.

The lawsuit said the article doesn't back up Noble's statement with evidence, and that CNN and Noble had both shown a pattern of bias against President Trump.

A CNN spokeswoman said the news group had no comment on the lawsuit.

Earlier this week, the campaign sued The Washington Post for similar opinion pieces that discussed the Trump campaign welcoming Russian help in 2016. A week earlier, The New York Times was the target, for a Max Frankel op-ed suggesting that Mr Trump and Russia had an understanding to exchange campaign help for more favorable policies toward the country.