President Trump's national security adviser has denied knowing the editor of The Atlantic after accidentally adding him to a sensitive group chat.

Mr. Goldberg, who was included on a private text thread discussing war plans, was a longtime national security reporter who became editor of The Atlantic in 2016.

Screenshots shared by Goldberg show Waltz added the journalist to the Signal chat about an upcoming attack on the Houthi rebels in Yemen, but Waltz has repeatedly said he had neve