Donald Trump has opened up a 20-point lead in the latest polls for the Republican presidential nomination, but Establishment candidates Jeb Bush and John Kasich still refuse to affirm they will support him, despite public pledges to back the eventual nominee.

During Sunday news show appearances, both candidates dodged questions about whether they would back Trump. They had both raised their hands during a GOP debate when asked who would support the party’s nominee.

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“Donald Trump is not going to get the nomination,” Bush, Florida’s former governor, said Sunday on ABC’s “This Week.” “I have enough confidence in the Republican primary voters in these early states and beyond. I’ll trust them to make that decision.”

Kasich admitted, “I signed a pledge that I would support the Republican.”

But he added, “Look, I have to tell you … I believe that Donald Trump will not be the nominee.”

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Both Bush and Kasich, the governor of Ohio, mounted a fresh round of attacks on Trump, now the overwhelming front-runner by any measure, and sought to portray him as an unworthy candidate who is full of hot air and little substance.

“He’s not a serious candidate,” Bush continued, repeating something he has said before. “He’s not offered anything serious as it relates to the fight against terror. He’s not offering any proposals as it relates to dealing with these structural challenges we face going forward.”

But Jeb conceded that he understands Trump’s appeal.

“He’s a gifted politician. He connects with people’s angst and their anger. But over the long haul, we need to have productive, constructive ideas to lift people up,” he said.

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Kasich seconded Jeb’s views on CNN’s “State of the Union” and expressed the belief that Trump would soon fizzle out.

“I think things will settle down. And I believe, at the end of the day, (that) experience is what counts — somebody who has been a reformer, but somebody who has experience.”

Kasich also defended an eerie ad released by his campaign last month insinuating that Trump has fascist characteristics and likening his rise to that of Hitler in Nazi Germany.

On Sunday, the Washington Post editorial board called Trump “corrosive to the political debate” and beseeched House Speaker Paul Ryan, R-Wis., and Senate Majority Leader Mitch McConnell, R-Ky., as well as Republican presidential candidates to publicly affirm they would not endorse Trump for the presidency.