The site, called GETTR, describes its mission as "fighting cancel culture, promoting common sense, defending free speech, challenging social media monopolies, and creating a true marketplace of ideas." It will officially launch on Sunday, July 4.
It is unclear what involvement the former President may have had. Trump, 75, was removed from Facebook and Twitter earlier this year.
Miller — who was also Trump's former spokesperson — reportedly created the app to declare "independence" from Big Tech, and to create a "cancel-free zone" with "superior technology" which will "be the envy" of Silicon Valley.
Miller confirmed that an account with the username @realDonaldTrump "is waiting for him and ready to go… I hope he joins, but President Trump has a number of different options he’s considering."
"Let’s get together, we’re talking about a sense of community," Miller told Fox News, explaining that the name evolved from "Get Together." "We think it will ultimately be a global platform—not just conservatives in the U.S." Miller said that the team wants people from all political backgrounds to join.
"We believe there needs to be a new social media platform that really defends free speech, and one that doesn’t de-platform for political beliefs," he said. "This is a challenge to social media monopolies."
Miller also said that users can import their tweets to GETTR "so that your hard work, creativity, your intellectual property comes with you" but is a "one-time option upon creating your account."
When it comes to potential backlash or legal issues from Twitter, Miller said it is "a fight I don’t mind picking."
"They are not publishers, they can’t have it both ways," he said. "You can’t say we have a publishing exemption, but you can’t do anything with your own intellectual property. The rules are very clear, you own your tweets and you own your posts."
Miller said that the app will have a "tipping" option for users to be able to donate to creators so influencers can "monetize what they’re doing and posting right now." It will also have a live-stream option and an option to donate to political candidates, but Miller said they are still working on how to cap political donations to fall within election laws. He added that there was "no cap for online appreciation givers."
While Trump may not have officially joined yet, there have already been issues with imposters, Yahoo! Finance reported. At least two fake accounts, ReaIDonaIdTrump and realDonaIdTrump, were said to have been made before the company deactivated them. A Miller impersonater was also suspended.