Ravelry, a community site that allows users to share ideas on knitting and textile projects, said in a blog post on Sunday that it will remove users if they express support to Trump on its forum, profile pages or other content .  "We cannot provide a space that includes everything and also allow support for open white supremacy. Support for the Trump administration is undoubtedly support for white supremacy," the site said.
"You can still participate if you actually support the administration, you just can't talk about this," it added in the post that announced the policy.
Ravelry says it is used by hundreds of thousands of people every month and has more than 100,000 followers on Twitter. It said it could remove users from the site if they violated the rule, but added that they would not lose their data.
It also noted that people would not be removed for previous support.
"We do not join the Democrats or prohibit Republicans", the site added. "We absolutely do not prohibit conservative politics. Hats and intolerances differ from other types of political attitudes."
Trump has been accused of being equal to the threat of white supremacist individuals and groups during his presidency.
He said there were some "very fine people on both sides" after white nationalist marches collided with the Protestants in 2017 in Charlottesville, Virginia.
The president has also said that he does not see white nationalism as a growing threat around the world, instead of describing the movement as a small group of people "with very, very serious problems."
On other occasions Trump has rejected groups, including the Ku Klux Klan.