You have to wonder: Is there no limit to what Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE can say and get away with? So often during the campaign, we were certain: That’s it. He’s finally said something so outrageous his supporters will turn against him.

But it never happened. Not when he demeaned war hero John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE: “I like people that weren’t captured.” Nor when he belittled a Gold Star mother: “She was standing there. She had nothing to say. She probably, maybe she wasn’t allowed to have anything to say.” Not when he declared a federal judge incapable of issuing an unbiased opinion because his parents came from Mexico. Not when he invited Russia to hack Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE’s emails, nor when he insisted he actually won the popular vote, nor when he accused Pope Francis of being sympathetic to the Islamic State in Iraq in Syria.

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Had any other candidate said anything close to that, he or she would have been run out of politics by members of their own party. But not Trump. Not the ultimate Teflon candidate who seems able to say anything he wants — no matter how personal, mean, ugly or untrue — and never pay the price.

That is, until now. He dropped a nuclear bomb by suggesting that the United States is the moral equivalent of Vladimir Putin’s Russia.

As part of Super Bowl LI coverage, the president sat down for an interview with Fox News’s Bill O’Reilly. After gently questioning Trump on his “admiration” for Putin, O’Reilly pressed: “He’s a killer, though. Putin’s a killer.” Trump only shrugged: “There are a lot of killers. You think our country’s so innocent?”

Whoa! If that doesn’t disqualify Trump for the White House, what does? No, the United States is not perfect, but in terms of freedoms guaranteed, rights protected, opportunities offered, moral values and the way we treat our own citizens and other nations, Russia’s not even in the same ballpark.

And for anybody, let alone a president of the United States, to suggest otherwise is outrageous. No president has ever betrayed his own country so totally and so openly. Imagine the cries for impeachment hearings if that old “socialist” Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE had said the same thing.

But, this time, Trump went too far, even for members of his own party. “No, I don’t think there’s any equivalency between the way the Russians conduct themselves and the way the United States does,” Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.) told CNN’s Jake Tapper. And Sen. Marco Rubio Marco Antonio RubioHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Fla.) pointed out the obvious: “When has a Democratic political activist been poisoned by the GOP, or vice versa? We are not the same as Putin.”

For now, Republicans will stick with Trump. But even they must be asking themselves: What does Russia have on him? Video of sexual shenanigans, as that notorious dossier suggested? Big bank loans? The only way to find out is an FBI investigation, as called for by House Minority Leader Nancy Pelosi (D-Calif.).

What business ties does Donald Trump have with Russia? The American people have a right to know. And Congress has a duty to find out.

Press is host of “The Bill Press Show” on Free Speech TV and author of “Buyer’s Remorse: How Obama Let Progressives Down."