Does the Fed control Trump's 2020 destiny?

President Trump has frequently pointed to the rising U.S. stock market as affirmation of his economic supergenius. But what the market giveth, it can also taketh away.

This week, stocks dropped sharply after the first congressional testimony of Trump's new Federal Reserve Chairman Jerome Powell. Why? Perhaps because investors interpreted his comments as raising the odds that the central bank will accelerate its pace of interest rate hikes. The result could be higher-than-expected borrowing costs and lower corporate profits.

As it happens, just as Powell was alerting markets to the Fed's possibly more hawkish turn, the Drudge Report was blaring a headline that Trump was ready to announce his plans to run for re-election in 2020 and appoint a digital guru to run the effort. But clever Facebook ads won't be enough to win the president a second term. Team Trump is surely counting on the economy to provide a powerful tailwind for the campaign. Indeed, new forecasts from the White House economic team anticipate 2018 will be the start of a long-term upturn in economic growth.

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Wall Street economists aren't nearly as bullish. Yet they do acknowledge the economy's considerable near-term momentum, thanks in part to fiscal stimulus from the Trump tax cuts and higher Washington spending. Trump might well head into his re-election year with an unemployment rate sinking toward 3 percent. The lowest jobless numbers since Eisenhower was in the Oval Office could help persuade swing voters that Trump has indeed made America great again.

Unless the Fed mucks things up — as it has in the past.

Since the creation of the Fed, every single recession — with the exception of post-World War Two military demobilization — has been associated with monetary tightening. Either the Fed raised interest rates too far, too fast or it failed to offset tighter monetary conditions. For instance: Had Ben Bernanke's Fed acted more aggressively in 2008, the Great Recession might have been a more modest downturn at worst.

One Fed boss with a fantastic record of not screwing things up was Powell predecessor Janet Yellen, whom President Obama appointed in 2014 to succeed Bernanke. During her tenure, stocks soared, inflation stayed low, and the economy generated gobs of jobs. In a Wall Street Journal survey of economists, 60 percent gave her performance an A.

That track record wasn't enough for Trump, who broke with recent precedent by declining to reappoint Yellen to a second term. What made that move especially odd was her reputation as a monetary dove, who had mused about the possible benefits of running a low-rate, "high-pressure economy" to heal the scars of the Great Recession. On paper, she seemed a comfy fit for Trump, who has in the past stated his love for easy money. And his advisers must have been aware that past presidents have worried that a tight Fed would hurt their re-election efforts (LBJ, Nixon) or even blamed the central bank for losing (Bush I).

Then again, candidate Trump disingenuously blamed the Yellen Fed for creating a "false economy" to help Barack Obama. Pretty tough to appoint a Fed chair whom you've basically accused of corruption.

It's a charge Trump may live to regret if the Powell Fed makes a monetary mistake. With a persistently low approval rating, Trump likely needs a booming economy to win re-election.

Remember, the slow recovery during the Obama years was a terrible headwind for Hillary Clinton in 2016. The well-regarded election forecasting model from Yale University economist Ray Fair predicted Clinton would lose badly because of weak growth and voter antsiness, getting just 44 percent of the two-party vote. Instead, she overperformed with 51 percent (but still lost). Fair's explanation for his model's big miss:

Anything could still happen. The highly caffeinated U.S. economy may well power through future Fed rate hikes or higher rates due to higher budget deficits.​ (Fear of the latter or perhaps higher inflation from too much stimulus roiled markets earlier in February.) The Powell Fed might adeptly manage the transition to a higher rate environment. Trump had better hope so. More than almost any other potential GOP nominee in 2016, he needed a weak economy to be competitive. And he will almost certainly need a robust one to capture another four years.