WASHINGTON—Upon returning to the White House, President Donald Trump rolled out a raft of executive actions and sweeping policy changes, making his first 100 days among the most consequential starts to a presidential term in modern U.S. history.

Serving as the 47th president, Trump is picking up where he left off, revisiting key priorities from his first term that were delayed by the Russia investigation, derailed by nationwide Black Lives Matter riots, or sidelined during the COVID-19 pandemic.