An investigation into Interior Secretary Ryan Zinke's alleged healthcare threats against Alaska's senators has ended.

The Interior Department inspector general concluded "further investigation would be unproductive."

In July, two top House Democrats wrote a letter asking for an investigation into a phone call Zinke had with Sens. Dan Sullivan and Lisa Murkowski, reportedly saying Murkowski's vote against the legislation had put Alaska in jeopardy with the administration.

The letter also asked investigators to look into whether Zinke violated federal anti-lobbying laws as well as the Hobbs Act, which "prohibits actual or attempted robbery or extortion affecting interstate or foreign commerce."

Following the failed Obamacare repeal, President Trump tweeted his disappointment at Murkowski's decision not to support the Obamacare repeal.

The letter stated, "The close timing of these actions suggests an apparent pattern and organized effort within the Trump Administration involving the use of federal resources to advance partisan legislation."

Earlier this month, Zinke and Murkowski seemingly reconciled over beers.