The US Department of Justice and 15 states on Thursday sued Apple alleging it used the powerful demand for its iPhone and other products to drive up prices for its services and hurt smaller rivals in the first major antitrust effort against the smartphone maker by the Biden administration.

Apple joins a list of major tech companies sued by US regulators, including Alphabet’s, Meta Platforms and Amazon.com across the administrations of both former President Donald Trump and President Joe Biden.

“Consumers should not have to pay higher prices because companies violate the antitrust laws,” Attorney General Merrick Garland said in a statement. “If left unchallenged, Apple will only continue to strengthen its smartphone monopoly.”

The Justice Department, which was also joined by the District of Columbia in the lawsuit, alleges that Apple uses its market power to get more money from consumers, developers, content creators, artists, publishers, small businesses and merchants.

The 88-page lawsuit, filed in US federal court in Newark, New Jersey, said it was focused on “freeing smartphone markets from Apple’s anticompetitive and exclusionary conduct and restoring competition to lower smartphone prices for consumers, reducing fees for developers, and preserving innovation for the future.”

In the lawsuit, the US added that “Apple repeatedly chooses to make its products worse for consumers to prevent competition from emerging.”

Apple disagreed in a statement, saying: “This lawsuit threatens who we are and the principles that set Apple products apart in fiercely competitive markets. If successful, it would hinder our ability to create the kind of technology people expect from Apple — where hardware, software, and services intersect.”

Apple shares were trading 3% lower.

Apple has already been subject to antitrust probes and orders in Europe, Japan and Korea, as well as lawsuits from corporate rivals such as Epic Games.

One of Apple’s most lucrative businesses—its App Store, which charges developers commissions of up to 30%—has already survived a lengthy legal challenge under US law by Epic. While the lawsuit found that Apple did not violate antitrust laws, a federal judge ordered Apple to allow links and buttons to pay for apps without using Apple's in-app payment commission.

In Europe, Apple’s App Store business model has been dismantled by a new law called the Digital Markets Act that went into effect earlier this month. Apple plans to let developers offer their own app stores - and, importantly, pay no commissions - but rivals such as Spotify and Epic argue Apple is still making it too hard to offer alternative app stores.

The rulings on Apple’s App Store forced the Justice Department to look at Apple’s other practices for the basis of a complaint, such as how Apple allows outside firms to access the chips and sensors in the iPhone.

Consumer hardware firms, such as smart-tracker maker Tile Inc, have long complained that Apple has restricted the ways in which they can work with the iPhone’s sensors while developing competing products that have greater access.

Apple began selling AirTags—which can be attached to items like car keys to help users find them when they are lost—several years after Tile had been selling a similar product.

Similarly, Apple has restricted access to a chip in the iPhone that allows for contactless payments. Credit cards can only be added to the iPhone by using Apple’s own Apple Pay service.

And Apple has also faced criticism over its iMessage service, which only works on Apple devices.

Apple has long argued that it restricts access to some user data and some of the iPhone’s hardware by third-party developers for privacy and security reasons.