A bipartisan pair of senators are calling on the Justice Department to investigate whether Russian intelligence services posed as an Islamic extremist hacker group that sought to harass U.S. military families.

Sens. Ron Wyden Ronald (Ron) Lee WydenDemocrats call for declassifying election threats after briefing by Trump officials Read Democrats' report countering Republicans' Biden investigation Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (D-Ore.) and Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (R-Colo.) wrote a letter to Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE on Monday asking him to investigate whether a hacking group called the “Cyber Caliphate” launched an intimidation campaign against members of military families in 2015.

“If substantiated, the claims about APT28 posing as the Cyber Caliphate could be the first public evidence that influence operations have specifically targeted American military families,” Wyden and Gardner wrote in their letter to Sessions.

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“This story would be cause for concern if it ended there but many cyber security researchers now say the Cyber Caliphate is merely a front for APT28, the infamous group of hackers who serve the interests of Russian President Vladimir Putin,” they continued.

The lawmakers noted that such efforts could result in serious consequences for U.S. military families.

“If left unchecked, such operations would threaten the personal liberty, financial security, mental health, and morale of our military families,” they wrote, adding that “at least one military spouse fled her home in fear.”

The Associated Press first reported in May that Russian intelligence was allegedly behind the harassment.

Military spouses were reportedly harassed in Wyden's and Gardner's respective states.

The announcement comes several hours after Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE announced that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE indicted a dozen Russian intelligence officers for hacking and releasing information from the Democratic National Committee during the 2016 presidential election.