Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.) on Tuesday ripped into President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE over his decision to withdraw the U.S. from the Iran nuclear deal.

In a Twitter thread, Feinstein said that Trump “wants to undo” everything accomplished by the previous administration.

Everything President Obama has done, this president wants to undo. An agreement that prevents Iran from acquiring a nuclear weapon is one thing that should never be undone just to satisfy a campaign promise. — Sen Dianne Feinstein (@SenFeinstein) May 8, 2018

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“Everything President Obama has done, this president wants to undo,” she said. “An agreement that prevents Iran from acquiring a nuclear weapon is one thing that should never be undone just to satisfy a campaign promise.”

Trump announced Tuesday that he would move to reinstate U.S. sanctions and impose other penalties on Iran.

The move has been met with considerable opposition from Democrats, diplomats and European leaders.

Feinstein warned that withdrawing from the 2015 agreement “may spark a nuclear crisis in the world’s most volatile region.”

In withdrawing from the pact, Trump cited concerns over human rights violations and support for terrorism in Iran. Feinstein pushed back on these claims, saying that those issues will now be more difficult for the U.S. to address because Trump “has alienated the nations who share our concerns.”

“I urge the president to reconsider and work with our partners to improve the deal we have today,” she said. “Withdrawing may force the president to sanction our closest allies, and may give Iran pretext to violate the terms of the strongest nuclear agreement ever negotiated.”

Feinstein is up for reelection in November and is facing a strong Democratic challenger. Former President Obama offered his endorsement for Feinstein earlier this month.