Christine Todd Whitman, a former GOP governor from New Jersey, called on 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 to step down following his controversial press conference with Russian President Vladimir Putin on Monday.

Whitman, who served in President George W. Bush's administration as Environmental Protection Agency chief and has been a frequent critic of the current president, called Trump's actions at a press conference with Russian President Vladimir Putin "irrational and dangerous."

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“Mr President, you should be ashamed,” Todd Whitman, who voted for Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in 2016, said on Twitter. “To deny your own country and government in favor of a foreign leader whose country has, for decades, tried to undermine the United States is irrational and dangerous.”

“Please step down, you are not fit to lead this great nation,” Todd Whitman continued.

Mr #President, you should be ashamed. To deny your own country and government in favor of a foriegn leader whose country has, for decades, tried to undermine the #UnitedStates is irrational and dangerous. Please step down, you are not fit to lead this great #nation. #TrumpPutin — Gov Christie Whitman (@GovCTW) July 16, 2018

Todd Whitman has battled with Trump over climate policy. Unlike many within the Republican Party, she believes the GOP should tackle the issue of climate change.

She joins a number of Republicans in criticizing Putin's performance at the Helsinki press conference, including Sens. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (Ariz.), Ben Sasse Benjamin (Ben) Eric SasseTrump says he'll sign order aimed at protecting premature babies in appeal to religious voters Government watchdog recommends creation of White House cyber director position Chamber of Commerce endorses McSally for reelection MORE (Neb.) and Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (N.C.), the chairman of the Senate Intelligence Committee.