WASHINGTON - President Trump said on Thursday he had agreed to pleas from the leaders of Canada and Mexico not to withdraw immediately from the North American Free Trade Agreement, but he warned he would still pull the United States out if he could not negotiate a better deal.

Ms. MacGuineas's group estimates that Mr. Trump's plan could reduce federal tax revenue by $3 trillion to $7 trillion over a decade. The economy would need to grow at a rate of 4.5 percent - more than double its projected rate, an unlikely prospect - to make the plan self-financing.

WASHINGTON - Congressional Republicans introduced a measure late Wednesday to keep the government open past Friday's deadline, giving themselves more time to finalize a spending bill. The stopgap legislation would continue government funding through May 5, averting a government shutdown this weekend. The measure still needs to be approved by the House and Senate.

WASHINGTON - Two American service members were killed in action Wednesday night in an operation in Afghanistan, the Pentagon said. Capt. Jeff Davis, a Pentagon spokesman, said the service members were killed in an action targeting the Islamic State in Nangarhar province.

WASHINGTON - Michael T. Flynn, President Trump's first national security adviser, is under investigation by the Defense Department's inspector general to determine whether he failed to get permission to receive payment from a foreign government, according to a letter released on Thursday by the top Democrat on the House Oversight Committee.

There's a critical factor that affects America's role in the global refugee crisis that often goes unmentioned: the Atlantic Ocean. Data compiled by the United Nations' refugee agency allows us to map the distribution of refugees by country. As you might expect, many are centered in the countries that adjoin areas of conflict.

"The president has made clear, when you have 12, 14, 15 million people in the country illegally, that there has to be a system of priority, and right now, ICE's priority is going to make sure that we focus on first and foremost on that."

Left uncertain is what, if anything, will happen regarding Stephen K. Bannon, the president's chief strategist, who has played a major role in shaping foreign policy. Under the original organization plan last month, Mr. Bannon was invited to attend any National Security Council meeting led by the president and was made a regular member of the so-called principals committee of cabinet secretaries.