Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) tore into President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Monday for his hostility towards Iran, asking if he is "planning to start a war to get re-elected?"

"Obama improved relations with Iran," Sanders tweeted, quoting a tweet from Trump in November 2011 in which Trump claimed former President Barack Obama Barack Hussein ObamaThe Memo: Trump's strengths complicate election picture Obama shares phone number to find out how Americans are planning to vote Democrats' troubling adventure in a 'Wonderland' without 'rule of law' MORE would start a war with Iran to help his re-election effort.

No, Obama improved relations with Iran. Are YOU, President Trump, planning to start a war to get re-elected? https://t.co/MyL5LGaSIv — Bernie Sanders (@SenSanders) July 23, 2018

The comments from Sanders, a frequent Trump critic, come a day after Trump sent an all-caps tweet warning Iranian President Hassan Rouhani that the nation would suffer "consequences" if it didn't stop its threats against the U.S.

To Iranian President Rouhani: NEVER, EVER THREATEN THE UNITED STATES AGAIN OR YOU WILL SUFFER CONSEQUENCES THE LIKES OF WHICH FEW THROUGHOUT HISTORY HAVE EVER SUFFERED BEFORE. WE ARE NO LONGER A COUNTRY THAT WILL STAND FOR YOUR DEMENTED WORDS OF VIOLENCE & DEATH. BE CAUTIOUS! — Donald J. Trump (@realDonaldTrump) July 23, 2018

The message from Trump came after Rouhani reportedly told a group of diplomats that "war with Iran is the mother of all wars."

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National security adviser John Bolton says Iran would "pay a price" if it continues to act negatively towards the U.S.





Iran Foreign Minister Javad Zarif then fired back in a tweet, saying that Iran is "unimpressed" by Trump's warning.

The escalating tensions between the nations come after Trump withdrew the U.S. from the Iran nuclear deal earlier this year. The Obama-era agreement eliminated sanctions on Iran in exchange for the nation abandoning its nuclear program.

Every other country in the pact has said it will uphold the deal.