Cruz explained too why he turned his back on the loyalty pledge he signed a year ago, which had been pushed by the Republican National Committee (RNC) and which stated that candidates would support the eventual Republican nominee and would not seek a third-party run.
He didn't deliver even a half-throated endorsement.
Trump mentioned how he left the business world for this gig.
"So Ted Cruz took his speech that was done, was on the Teleprompter, said 'Hello, ' then made a statement that wasn't on the speech, then went back to his speech", Trump said. "Endorse Trump!" broke through the booing.
Then, when Cruz stepped up to the podium, he added a sentence, "which could have been viewed as a nasty thing and implying something", Trump said. Ted Cruz isn't backing down.
"They all signed the pledge Everyone knew about the pledges", campaign chair Paul Manafort told reporters Thursday morning, referring to a primary pledge to support the eventual GOP nominee.
The speechwriter, Meredith McIver, said Mrs. Trump had read excerpts of Mrs. Obama's speech to her as examples of things she liked.
Ivanka, Trump's older daughter and the last of four Trump children to speak at the convention, sought to underscore her father's personal warmth beneath the public persona.
"See, now, if I don't win, I'm going to blame Mike, right?" Instead, he tried to remold Cruz's non-endorsement into an endorsement.
As chants of "Endorse Trump" began to emanate, NY delegates stood and shouted feet from where the former presidential hopeful was delivering his speech. But by how much? She said Cruz should have endorsed the ticket as he pledged to do as a candidate in the GOP primary.
"I am not in the habit of supporting people who attack my wife and attack my father", he told a meeting of the Texas delegation in Cleveland. He was not going to be "a servile puppy dog".
"You would think it would occur to him", she continued, piling on the senator, "'Every place I've ever been, everyone has hated me.
Reaction to Cruz was swift. He was barred from a post-speech reception by mega-donor Sheldon Adelson, according to various news reports.
Kasich attended the OH delegation breakfast to introduce Lt. Gov. Mary Taylor, whom he praised for working with him on hard issues such as opioid abuse.
Traditional politicians, regardless of party, find ways to work out disputes like this, perhaps with a bottle of the rival's favorite beverage.
Trump also hinted that he might seek revenge down he road.