The frenetic first three weeks of Donald Trump's presidency have left political leaders divided and dizzy with uncertainty over what happens next.

WASHINGTON The frenetic first three weeks of Donald Trump's presidency have left political leaders divided and dizzy with uncertainty over what happens next.

This week, it will be Federal Reserve Chair Janet Yellen's turn to weigh in if she chooses to on how the economy could fare in the early months of Trump's administration.

Are Trump's proposed tax cuts, stimulus spending, trade tariffs and deregulation the right economic recipe? And does Yellen see the Fed raising rates three times this year, as the central bank in December forecast it would?

Few expect clear-cut answers from the Fed chair's semiannual testimony to Congress first to a Senate committee Tuesday and then to a House panel Wednesday. The official topic will be, as always, the outlook for the economy and the Fed's interest rate policy. But Yellen will surely be asked whether she think Trump's program will more likely accelerate or weaken the economy.

In part because of uncertainty over the forthcoming details of Trump's economic plans, investors expect the Fed to leave rates alone for the next few months, perhaps until its June meeting. Even after Trump's proposals are spelled out, uncertainty will swirl around how well they will survive intact through Congress.

"A lot of what the Federal Reserve will do this year will depend on what President Trump and Congress do, and at the moment we have no idea what will emerge from Congress," said Mark Zandi, chief economist at Moody's Analytics. "Until there is some clarity about what President Trump and Congress have in mind, I think the Fed is going to be cautious."

In December, the Fed modestly raised its benchmark short-term rate to a range of 0.5 percent to 0.75 percent, its first increase since December 2015. Until then, the Fed had left its key rate unchanged at a record low near zero for seven years to energize an economy pummeled by the most severe recession in decades. In December, the Fed also forecast that it would raise rates three times in 2017.

After it met again early this month, the Fed issued a statement that noted improved sentiment among consumers and businesses. And the Fed said it had become more confident that inflation will reach its 2 percent target. But it offered no hints about when it would resume raising rates.

Many economists caution that the pace of rate increases could change quickly depending on how much success Trump has in getting his economic initiatives enacted. The president is expected to formally present his program in the coming weeks, offering tax cuts for individuals and businesses and increased spending on infrastructure projects and a rollback of government regulations.