Trump is expected to address the issue of illegal immigration when he hosts a campaign rally in Grand Rapids, state of Michigan later Thursday.

The last time Trump threatened to seal the southern border was late last year, when the White House and Congressional Democrats couldn't reach an agreement over his demand for billions of U.S. dollars in funding for a wall along the U.S.-Mexico border, a plank of his 2016 presidential campaign.

Democrats refused to give what Trump had required, arguing that president was exaggerating the situation on the border for political gains while calling the proposed border wall costly and unnecessary. Trump retaliated by declining to sign spending bills, resulting in a record-breaking 35-day partial government shutdown, which ended in January.

To acquire access to money for building the wall, Trump declared a national emergency in mid-February, a move that has drawn sharp criticism from Democrats and raised concerns among Republicans.

The U.S. House of Representatives, controlled by Democrats, failed earlier this week to override Trump's veto of a congressional resolution blocking his national emergency declaration.

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