The 'Never Trump' movement has emerged from the ashes
Donald Trump Holds Town Hall In New Hampshire
Donald Trump Holds Town Hall In New Hampshire

(Darren McCollester/Getty Images)
Donald Trump listens to a question during a town-hall event.

It was a terrible, horrible, no good, very bad week for Donald Trump — one that allowed the "Never Trump" movement to emerge from the ashes with some much-needed newfound energy.

The presumptive Republican nominee prompted sharp criticism from members within his own party when he publicly argued that a US federal judge’s Mexican heritage made him unfit to oversee fraud cases involving Trump University.

The comments were strongly rebuked by House Speaker Paul Ryan and condemned from all sides of the party. Senate Majority Leader Mitch McConnell went as far as to recommend the New York businessman “use a script more often” and pleaded with him to “change direction.”

And as the week went on, the Never Trump movement — the segment within the party that coalesced midway through the primary to prevent his nomination, but to no avail — grew louder and louder.

On Tuesday, Steve Lonegan, former New Jersey chairman for Ted Cruz's 2016 White House bid, said delegates attending the Republican National Convention in Cleveland have a "moral obligation" to "break the rules" and stop Donald Trump from securing the nomination.

One day later, conservative talk-show host Hugh Hewitt echoed Lonegan, imploring the GOP to examine what it would take to change the rules so that it could dump Trump at the convention. He likened the billionaire to “stage-four cancer” destroying the health of the Republican Party.

Tim Miller, the communications director of an anti-Trump PAC and former adviser to Jeb Bush's presidential campaign, wrote on Twitter that the GOP should “amend the rules to allow each delegate to make an objection of conscience to Trump on the 1st ballot.”

And in Politico's Playbook newsletter, Mike Allen said the scenario was “highly unlikely to happen,” but said it was “no longer unthinkable that establishment Republicans” may “seriously ponder a movement to deny him the nomination.”

Donald Trump Holds Campaign Rally In Warren, Michigan
Donald Trump Holds Campaign Rally In Warren, Michigan

(Scott Olson/Getty Images)
Republican presidential candidate Donald Trump speaks to guests during a rally at Macomb Community College on March 4, 2016, in Warren, Michigan.

In conversations with Business Insider, some of the movement’s top leaders said Trump’s comments had ignited new behind-the-scenes efforts to stop the real-estate mogul from becoming the party’s standard-bearer.

“I have had a number of donors and elected officials call me in the past 48 hours who were very adamant just two weeks ago that I should get on board with Trump. Now they are all looking for options realizing they really can’t control Trump,” said Erick Erickson, the former editor-in-chief of RedState and founder of the conservative website The Resurgent.