WASHINGTON — Stephen Miller was furious — again.
The architect of President Trump’s immigration agenda, Mr. Miller was presiding last month over a meeting in the White House Situation Room when he demanded to know why the administration officials gathered there were taking so long to carry out his plans.
A regulation to deny welfare benefits to legal immigrants — a change Mr. Miller repeatedly predicted would be “transformative” — was still plodding through the approval process after more than two years, he complained. So were the new rules that would overturn court-ordered protections for migrant children. They were still not finished, he added, berating Ronald D. Vitiello, the acting head of Immigration and Customs Enforcement.