Former New Jersey Gov. Christine Todd Whitman (R) on Wednesday called it "extraordinarily offensive" for President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE to argue that collusion is not a crime.

"I find it extraordinarily offensive," she said on MSNBC's "The Beat with Ari Melber."

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"Frankly, I don’t care whether it’s a crime in the criminal codebook or not," she continued. "It is against the best interests of the United States. You do not collude."

Trump has repeatedly denied his campaign worked with Russian agents during the 2016 presidential race. He further tweeted on Tuesday that "collusion is not a crime."

"Collusion is not a crime, but that doesn’t matter because there was No Collusion (except by Crooked Hillary and the Democrats)!" Trump wrote on Twitter.

Collusion is not a crime, but that doesn’t matter because there was No Collusion (except by Crooked Hillary and the Democrats)! — Donald J. Trump (@realDonaldTrump) July 31, 2018

His lawyer Rudy Giuliani made the rounds on Monday morning talk shows with the same claim.

"I have been sitting here looking in the federal code trying to find collusion as a crime,” Giuliani said on “Fox & Friends.” “Collusion is not a crime.”

While collusion itself is not a federal crime, anyone found collaborating with Moscow-linked agents on the 2016 election could be charged with other crimes, such as conspiracy, according to CNN

Whitman last week penned a Los Angeles Times op-ed calling on fellow members of the GOP to ask Trump to step down.

"I am a lifelong Republican," wrote Whitman, who also served as the Environmental Protection Agency administration former President George W. Bush. "My Republican colleagues — once rightfully critical of President Obama’s engagement strategy with Russian leader Vladimir Putin — have to end their willful ignorance of the damage Trump is doing both domestically and internationally."

"We must put aside the GOP label, as hard as that may be, and demonstrate the leadership our country needs by calling on the president to step down," she added.

During her interview on MSNBC, Whitman said she came to this conclusion after watching Trump degrade U.S. allies at the NATO summit and then appear to downplay Russian interference in the 2016 election during a press conference with Russian President Vladimir Putin in Helsinki, Finland, earlier this month.

"When you diss our allies in the way he did, treat them the way he did, and then you cozy up to someone like Vladimir Putin who is not our friend," Whitman said. "He, to my mind, really forgot his oath of office to protect and defend the constitution of the U.S. against all enemies, foreign and domestic."

Trump was roundly criticized by members of the GOP for his remarks during the Helsinki press conference.