Roberta Rampton

Nikki Haley, a rising Republican star, said on Tuesday she was stepping down as U.S. ambassador to the United Nations, but knocked down speculation that she might challenge President Donald Trump at the next election.

The Trump administration on Wednesday pulled out of two international agreements after Iran and the Palestinians complained to the International Court of Justice about U.S. policies, the latest withdrawal by Washington from multilateral accords.

The United States and Canada reached a deal on Sunday to salvage NAFTA as a trilateral pact with Mexico, beating a midnight deadline with agreements to substantially boost American access to Canada's dairy market and protect Canada from possible U.S. auto tariffs, sources with direct knowledge of the talks said.

Auto stocks soared and the S&P 500 and the Nasdaq rallied to record highs on the expectation that Canada would sign onto the deal.

President Trump planned to leave the summit of the Group of Seven wealthy nations on Saturday before it discussed climate change and the health of oceans, underlining fractures in the G7 exacerbated by U.S. trade tariffs.

Prime Minister Justin Trudeau this week plays host to a summit of the Group of Seven leading industrialized nations with six of the seven members outraged at the United States over a slew of recent moves by President Donald Trump.