Trump and first lady Melania traveled to the University Medical Center of Southern Nevada on a private visit to see patients and medical professionals there.
Trump and his fellow Republicans have sought to make the migrant caravan and immigration major issues before the Nov. 6 elections, in which Republicans are battling to keep control of Congress.
Trump was asked by a reporter at a cabinet meeting Wednesday morning in the White House whether he would accept a bill containing border wall funding below billion.
Trump's decision to withdraw US troops in Syria was one of the reasons that led to the resignation of Defense Secretary James Mattis on Thursday, according to media reports.
Treasuries fell on the report, as the yield on the 10-year US Treasury rose as high as 2.597 percent before falling back to 2.56 percent following a billion auction that attracted strong demand, traders said.
Trump's announcement came as Secretary of State Mike Pompeo is in Jerusalem, lauding warm ties with Israel and promising to step up pressure on Iran. Pompeo's words gave a public boost to the Israeli leader at the height of a tight re-election campaign. Netanyahu is to be in Washington for two days next week — two weeks before Israel's April 9 ballot.
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Trump revealed the operation on Twitter last month and then postponed it. It is unusual for the government to announce deportation operations ahead of time.
Trump warned the Democratic People's Republic of Korea on Thursday of "an event the likes of which nobody's seen before", following Pyongyang's disclosure of a plan to fire missiles near the US territory of Guam.
Trump did not pledge to lift the sanctions but said he welcomed an end to the "harsh relationship" the countries had over the past two months.
Trump's words were immediately opposed by legal experts and officials.