“We understand the desire for our decisions to be ‘yes/no’ binaries, but it is not that simple,” Vijaya Gadde, who leads Twitter’s trust and safety teams, wrote to Harris.

“We reviewed the Tweets you cite in your letter, and they do not violate our policies against abusive behavior, targeted harassment, or violence on the service,” she added.

Twitter introduced a policy earlier this year that allows world leaders to break its rules without being penalized or getting suspended as long as the company deems the tweets to be in the “public interest.” However, the company said it would take action on tweets from world leaders that promote terrorism or include direct threats of violence made against an individual.

Responding to the letter, Ian Sams, Harris’ national press secretary, said in a statement provided to CNN, “The point is simple: Twitter is not holding Donald Trump accountable for abusing their platform to threaten people and incite and inspire violent behavior. We cannot be serious about cracking down on the ways social media companies allow hate speech, disinformation, lies, and threats of violence to flourish on their platforms if we do not demand accountability across the board.”