Russian intelligence agents attempted to breach Sen. Claire McCaskill Claire Conner McCaskillMissouri Senate candidate giving away machine that can print untraceable guns The Hill's Morning Report — Senate focuses on Russia as midterms loom Pair of DC fundraisers aims to boost McCaskill challenger MORE's (D-Mo.) reelection campaign ahead of the 2018 midterm elections, The Daily Beast reported Thursday.

The news site reported that McCaskill, considered among the most vulnerable senators up for reelection, was one of three congressional candidates a Microsoft executive said last week had been targeted by hackers.

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“I’m not going to speak of it right now,” McCaskill told the Daily Beast. “I think we’ll have something on it next week. I’m not going to speak about it right now. I can’t confirm or do anything about it right now.”

The report comes shortly after special counsel Robert Mueller Robert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE indicted 12 Russian intelligence officers in the hacking of the Democratic National Committee in 2016, the latest charges filed in his ongoing probe of Moscow's election interference.