Twitter says CEO Jack Dorsey informed in advance of decision to tag Donald Trump tweet

Twitter CEO Jack Dorsey was informed in advance by the company's staff of a decision to tag a tweet by President Donald Trump as "glorifying violence", a spokeswoman for the company said.

"The decision was made jointly by teams within Twitter, and our CEO Jack Dorsey was informed of the plan before the Tweet was labelled," the spokeswoman said in an email.