The US Space Force has recently confirmed the presence of American weapons in Earth orbit. 

A Space Force spokesperson remarked: "Space control encapsulates the mission areas required to contest and control the space domain – employing kinetic and non-kinetic means to affect adversary capabilities through disruption, degradation and even destruction, if necessary."

The capabilities and features of these weapons are unknown, but it is likely that some of these weapon satellites contain radio disruptors, which would block communications from adversary nations during a conflict.

Some experts have raised concerns about it breaking the 1967 Outer Space Treaty, specifically the clause:

"Parties to the Treaty undertake not to place in orbit around the earth any objects carrying nuclear weapons or any other kinds of weapons of mass destruction, install such weapons on celestial bodies, or station such weapons in outer space in any other manner."

In the text, it specifies that placing weapons of mass destruction is not allowed, in orbit, on the surface of other celestial bodies (that is planets, moons, asteroids, etc.), or in other areas of space. 

But, it is unlikely these satellite weapons would be considered weapons of mass destruction, and therefore do not violate the treaty.