A sense of déjà vu overwhelmed Wall Street this week, as Donald Trump’s election win gave the stock market a jolt similar to what happened after his victory eight years ago. Small caps soared, banks leaped and the S&P 500 Index had its best Election Day in history and strongest week in 12 months.

One of Wall Street’s last remaining bears warned Thursday that the S&P 500 is approaching “mania” levels as stocks become more expensive, setting up the potential for a further surge in the near term followed by a painful pullback.

U.S. stocks are ticking higher ahead of the Federal Reserve’s announcement coming later in the afternoon about what it will do with interest rates.

All year, a slew of Wall Street pros have questioned the durability of an indiscriminate risk rally that has fattened stock prices by trillions of dollars, sent Bitcoin soaring, fueled a credit bonanza,