The US president, always busy on social media, was extra communicative during the recent Israel-Iran conflict.

The Mideast cease-fire and Trump’s tariffs are affecting global markets. Follow along for live updates on the Dow, S&P 500 and Nasdaq.

A shaky cease-fire between Israel and Iran sent a burst of optimism through markets. Investors had been looking warily at the possibility of a widening conflict, after the U.S. struck Iranian nuclear ...