OPINION: Warning signs for Trump loom as he unveils budget

Early warning signs are flashing for President Donald Trump on some of his core arguments on immigration, the economy and North Korea that are central to his 2020 re-election message.

Complications on each of those policy areas threaten to undermine the narrative of unprecedented success that the President has weaved around his first two years in office and are driving political debate as the administration unveils its budget on Monday.

A poorer than expected monthly jobs report Friday fed concern that strong economic growth that anchors Trump's best argument for...