Investment guru Jeremy Siegel says the stock market wouldn’t be rattled if President Donald Trump would suddenly leave office.

“If you want to know the truth, I think the stock market prefers President Michael Pence to Donald Trump,” he told CNBC.

To be sure, Wall Street fell on Friday, whipsawed by developments with a probe into Russia’s alleged involvement in the U.S. election as well as with progress on a tax bill in Congress.

“If, for whatever reason, Trump leaves office, whether he's forced or resigns, whatever, what's bad about that? The whole rally of this year is based on the Republican agenda, not the Trump agenda,” said the University of Pennsylvania's Wharton School finance professor who always claims stocks are the best long-term investment.

“The market never liked the Trump agenda one bit,” he said.

It wasn’t so much about Trump himself winning the presidency last year that sparked a bull stock market, but rather “we finally had a president who would pass the Republican agenda,” he said.

“That the Republican agenda would pass, that's why the market rallied. Nobody rallied because of President Donald J. Trump. It rallied because now we had a Republican president who would sign tax reform and that was going to loosen regulations. Michael Pence will do that. Any Republican would do that,” he said.

Major indexes ended lower after an ABC News report that former national security adviser Michael Flynn was prepared to testify that before taking office Trump had directed him to make contact with Russians, Reuters reported.

The benchmark S&P 500 was down as much as 1.6 percent and the Dow fell 350 points following the report. Flynn pleaded guilty on Friday to lying to the FBI about contacts with Russia's ambassador.

“I still think the tax plan is the prime mover of the equity market right now. Now the Flynn results throws more uncertainty in it I honestly don't see how that worsens the chances for tax reform package being passed,” he said.

“I know the market hates uncertainty, right? It's always going to do that but, you know, removing Donald Trump from office is not at all, in my opinion, a negative for the stock market,” he said.

“Think ahead on the Republican agenda. Think ahead on next year's midterm elections or, maybe more importantly, in three years the presidential elections. Given Trump's approval rating, having him out of office seems to actually make the Republican chances better and not worse in the midterms and the next presidential election. In my opinion.”

(Newsmax wire services contributed to this report).