(Reuters) -The U.S. Federal Communications Commission will terminate its investigation into EchoStar's ( SATS ) 5G buildout obligations in the country, according to a regulatory filing from the company on Tuesday.

The highly expected move follows EchoStar's ( SATS ) $17 billion deal to sell wireless spectrum to billionaire Elon Musk's SpaceX and comes about two weeks after it announced a $23 billion spectrum sale to AT&T ( T ).

In a letter to EchoStar ( SATS ) Chairman Charles Ergen on Monday, FCC Chair Brendan Carr wrote he had asked the agency staff to close the investigation and conclude that EchoStar ( SATS ) has satisfied its buildout obligations.

Carr said he also directed the staff to confirm EchoStar's ( SATS ) exclusive rights to a key spectrum block for ground and satellite use.

EchoStar ( SATS ), co-founded by telecommunications entrepreneur Ergen, faced the probe over slow deployment of 5G services.

SpaceX had also asked FCC to review EchoStar's ( SATS ) spectrum holdings, saying the telecommunications company might be "warehousing" valuable spectrum, which is not used to provide services.

The transactions with AT&T ( T ) and SpaceX continue to remain subject to FCC approval, the company said in the filing.