Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) slammed the Senate's decision on Thursday to levy new sanctions on Iran, saying that the penalties could put the 2015 nuclear deal at risk.

Sanders joined Sen. Rand Paul Randal (Rand) Howard PaulThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts MORE (R-Ky.) as the only senators to oppose the sanctions, which target both Iran and Russia. He said in a statement after the vote that, while he fully supported penalties against the Kremlin for its efforts to meddle in the 2016 election, the Iran sanctions could have dangerous consequences.

"That is not a risk worth taking, particularly at a time of heightened tensions between Iran and Saudi Arabia and its allies," Sanders said in a statement. "I think the United States should play a more even-handed role in the Middle East and find ways not only to address Iran's activities, but also Saudi Arabia's decades-long support for radical extremism."

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The bill, which passed the Senate 98-2, imposes sanctions on Tehran for its ballistic missile development, human rights violations, weapons transfers and support for designated terrorist groups. It also gives Congress the power to block attempts by the White House to roll back sanctions on Russia.

The new round of sanctions comes as at least four congressional committees are investigating Russia's role in the 2016 election and possible collusion between the Trump campaign and Moscow.

The Trump administration has urged lawmakers not to strengthen penalties on Russia, arguing that doing so could jeopardize the administration's ability to work and improve relations with the Kremlin.