Representatives from Facebook, Google, Twitter and other tech companies are expected to be part of the meeting, although Facebook head Mark Zuckerberg will not be in attendance. The decision puts the United States at odds with USA tech companies including Facebook and Google, which are expected to support the effort.
"Fundamentally it ultimately commits us all to build a more humane internet, which can not be misused by terrorists for their hateful purposes", she said at a joint news conference with Macron.
We [now] have tech companies and countries.
Users wanting to share the video changed aspects of the footage to side-step AI detection; Facebook said there were 900 different variations of the footage.
"We continue to be proactive in our efforts to counter terrorist content online while also continuing to respect freedom of expression and freedom of the press", it said.
The US tech giant announced that it will tighten rules in order to curb the spread of hate and terrorist ideas online in the aftermath of New Zealand's mosque shootings, which were livestreamed on Facebook.
Other world leaders took part in the summit including Justin Trudeau of Canda (centre) and Theresa May of the United Kingdom (right).
A group of tech companies that control some of the world's largest online platforms have signed on to a new pledge to work more with governments and each other to combat the threat of violent extremism on the internet two months after a live-streamed mass shooting in New Zealand.
The White House will not be joining the call to action but is supportive of its premise, according to The Washington Post.
"We welcome the continued momentum provided by support for the Christchurch Call as we work with global partners towards our mutual objectives for an open, interoperable, reliable, and secure internet".
The company also said that it will be investing more into detecting manipulated media.
But despite the endorsement from the biggest USA tech firms, Washington will not join for now, even though "we continue to support the overall goals reflected", the White House said in a statement. They include making it easier for users to flag up inappropriate content, using enhanced vetting for livestreaming and publishing transparency reports on material that's removed.
The company says it will spend $7.5 million to partner with three universities to develop tools preventing modified versions of terror videos from being reposted.
"It doesn't say what's the minimum duration and again that wouldn't change the gunman's video on the day because even if they banned him for life it wouldn't make much difference to the people who had seen the video".
A key aspect of the Call to Action is preserving freedom of expression, abiding by worldwide human rights law, and respecting a free, open and secure internet.