Sen. Mitt Romney said former Rep. Tulsi Gabbard's "treasonous lies may well cost lives."
His remarks followed comments from Gabbard about US-funded biolabs in Ukraine.
Russia last week baselessly accused the US of funding the development of bioweapons in Ukraine.
Republican Sen. Mitt Romney strongly condemned former Democratic Rep. Tulsi Gabbard, seemingly responding to comments she has made in recent days about US biological laboratories in Ukraine.
"Tulsi Gabbard is parroting false Russian propaganda. Her treasonous lies may well cost lives," Romney said in a tweet on Sunday afternoon. A representative for Romney did not immediately respond to Insider's request for comment on what specifically he was referring to.
Earlier in the day, Gabbard, who ran for president in 2020, posted a video on Twitter repeating claims about US-funded biolabs in Ukraine. She also appeared on Fox News host Tucker Carlson's show last week and said she was "deeply concerned" about claims of bioweapons in Ukraine.
Russia has spread a baseless claim that the US is funding the development of bioweapons in labs in Ukraine. Russian and Chinese state media amplified the claims, while the US warned they could indicate that Russia is planning to use chemical weapons in its invasion of Ukraine.
In a fact check of Russia's biolabs claims, The New York Times reported that there are biological labs in Ukraine that are backed by the US in an effort to prevent bioweapons from being made or used.
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