Hillary ClintonHillary Diane Rodham ClintonSanders to Clinton: 'This is not the kind of rhetoric that we need' Sekulow vows Bidens, Ukraine will be part of Trump impeachment defense Elizabeth Warren: More 'Hillary' than Hillary MORE’s campaign is out with a new video panning the Republican presidential field as “mad scientists” who deny the effects of climate change.

The new spot centers on the use of the phrase “I’m not a scientist” by Republican candidates when discussing climate change.

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“Faced with the threat of climate change, Republicans repeat one chilling phrase: I am not a scientist,” the spot says, before running down instances where former Gov. Jeb Bush (R-Fla.), Sen. Marco RubioMarco Antonio RubioCommerce Department withdraws Huawei rule after Pentagon pushback: reports  Veronica Escobar to give Spanish-language response to Trump State of the Union address Senators press DHS over visa approval for Pensacola naval base shooter MORE (R-Fla.), former Gov. Rick Perry (R-Texas), and Gov. Scott Walker (R-Wis.) all said the line.

“Feel the terror as they deny established science,” the video continues, as video of former Sen. Rick Santorum (R-Penn), Sen. Ted CruzRafael (Ted) Edward CruzJordan says he thinks trial will be over by next week The Hill's Morning Report — Dems detail case to remove Trump for abuse of power GOP-Biden feud looms over impeachment trial MORE (R-Texas), Sen. Marco Rubio (R-Fla.), Gov. Bobby Jindal (R-La.), and Donald TrumpDonald John TrumpTrump says his advice to impeachment defense team is 'just be honest' Trump expands tariffs on steel and aluminum imports CNN's Axelrod says impeachment didn't come up until 80 minutes into focus group MORE all push back against the idea that humans cause global warming or that there’s action that can be taken to prevent it.

“And the scariest part? One of these mad (not a) scientists could be president,” the ad closes.

Almost 9 out of 10 Democrats believe that global warming exists, compared to 45 percent of Republicans, according to a June poll by the Pew Research Center.

Climate change was Clinton’s theme of the day on Monday, the morning after she released her plan on expanding renewable energy to fight climate change. She laid out more on her plan in Iowa Monday, but didn’t take a side on the most controversial issue, the Keystone XL pipeline.