President Donald Trump began his second administration with a blitz of policy actions to reorient U.S. government priorities.

Most major economies are investing in ever-cheaper solar and wind power. The United States risks further ceding a global market to China.

The US president has already declared a national emergency at the border, as he begins his crackdown on immigration.

Donald Trump has already taken radical new stances on Greenland and the Panama Canal. What do security experts predict he'll ...