The Stop Trump movement just got stopped. Facing the slimmed-down field that his critics said would bring him down, Donald Trump routed Ted Cruz and John Kasich in all five Eastern states holding primaries Tuesday. Trump foes have long insisted the bombastic billionaire has a "ceiling" over his Republican support of 40 percent or less.

Instead, Trump easily cleared the 50 percent mark in Maryland, Pennsylvania and Connecticut. He topped 60 percent in Rhode Island and Delaware. On the heels of his landslide in New York last week, it's little wonder Trump declared himself the presumptive Republican nominee.

Donald Trump Steve Sands | WireImage | Getty Images

He still has political work to do. He hasn't yet won the 1,237 delegates he needs to secure a first-ballot nomination at the Republican convention in Cleveland this summer.

But odds are growing that he will get them by the time California concludes the primary season on June 7 — or if not, end up close enough to become unstoppable.

Cruz hopes for a last stand next week in the Indiana primary and Kasich in Oregon and New Mexico after that. But Tuesday's voting made the alliance they declared this week look feeble.

Bernie Sanders is in no better shape on the Democratic side. Like Trump, front-runner Hillary Clinton hasn't yet won enough delegates for a convention majority. But her victories in four of the five states voting Tuesday pulled her very close.