Donald Trump’s campaign app may be putting “America First,” but experts say it’s not necessarily prioritizing users’ privacy.

The Trump campaign’s smartphone offering seeks to collect and store the contents of users’ address books –– potentially vacuuming up large quantities of personal data about individuals who have never used the application and who may be unaware that it’s in the hands of the campaign.

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“It is perfectly legal to do so,” said Albert Gidari, director of privacy at the Center for Internet & Society at Stanford Law School.

“That you may betray your friends’ privacy in doing so is a matter of your ethics, not the site’s,” Gidari told ABC News. “Do people stop and think about this? Of course not!”