Trump ordered the U.S. to withdraw from the Paris climate agreement, placing the world's top historic emitter of greenhouse gases outside the global pact aimed at pushing nations to tackle climate change. Trump took the same action in his first term, a move which Biden reversed.

World leaders congratulated President Donald Trump on his inauguration Monday, with many urging stronger alliances or continued cooperation between their countries and the United States, in carefully crafted social media posts and statements.

Trump, who said he would not be a dictator “except for Day 1” of his presidency, signed a record number of executive orders on Monday.