The Republican Establishment is getting a “spanking” that will eventually help it come around to supporting Donald Trump, former George W. Bush economic advisor Lawrence Lindsey said Wednesday.

Lindsey said on “The Laura Ingraham Show” that people, by nature, tend not to be introspective. But he predicted there would be few conservative holdouts once the general election arrives.

“The Republican Establishment, if that’s what you want to call it, has really learned it’s lesson,” he said. “Learning is a very painful process,” he later added. “And maybe, to make the analogy, maybe the spanking is still happening and the learning comes a little bit later. But I do think there’s a greater realization that its the people who are in charge. No human being is quick to admit they’re wrong.”

Lindsey said Sen. Marco Rubio “got the kiss of death” with his embrace by the Establishment. He pointed out that Trump and Sen. Ted Cruz — the two least-liked candidates by insiders — have won about 80 percent of the delegates awarded so far in primaries and caucuses.

“We have to decide which personality is best,” he said.

Lindsey said 98 percent of the people supporting other Republican candidates will be onboard by the fall. The prospect of a Hillary Clinton presidency will concentrate minds, he said.

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“All of us are going to have to recognize in November that the candidate on the other side has many flaws, as well,” he said. “That’s a gross understatement.”

Any conservative tempted to support Clinton needs to “think twice, not just on policy but also on personality.”

Lindsey, former Federal Reserve Board governor and author of the new book “Conspiracies of the Ruling Class: How to break their grip forever,” agreed with critics who argue that the Federal Reserve Board has overstepped his bounds. But he said the prescription advocated by Sen. Rand Paul, R-Ky., and others — an audit — would be ineffectual. The board already has internal audits, he said.

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“What we really need is to take back some constitutional rights to be able to use things other than Federal Reserve notes to settle contracts,” he said. “We need to say, ‘OK, we can have a dollar, but the American people have the right to use something else if they want to. And if we have that right, the Fed is inherently checked and the abuses everyone is complaining about have to stop, because they’re suddenly going to have a competitor out there.”