Two of the biggest US banks, Citigroup and Bank of America, notched better-than-expected profits in the first three months of this year as traders raked in higher revenues amid President Donald Trump’s threat to start a global trade war.

Shares of major U.S. banks surged after Bank of America (BAC) and Citigroup (C) became the latest lenders to report better-than-expected first-quarter earnings on the back of a stock-trading boom. Bank of America shares were up 4.

Bank of America and Citigroup are expected to notch higher revenue and profit when they post results Tuesday morning. Their trading desks should have benefitted from a sharp rise in volatility in the