The White House published a recap of President Donald J. Trump’s CNBC Squawk Box interview, in which he discussed negotiations with Iran and said he expected a “great deal” but that the United States was prepared to take decisive action if talks fail. He also endorsed Kevin Warsh as his nominee to lead the Federal Reserve and outlined his views on interest-rate policy. On monetary policy, Trump said he has supported interest-rate rises to curb inflation while arguing that the United States “should have the lowest interest rate in the world.” He warned that an escalation in the Middle East could have severe market consequences, criticized Democratic lawmakers for public comments during negotiations, and questioned the need for NATO support. Separately, he said Spirit Airlines is in trouble and he would like an acquisition to preserve jobs, while expressing opposition to an American Airlines and United Airlines merger.