That's the question hanging over the heads of two former presidential contenders here in Cleveland - the last two men Donald Trump vanquished on his path to the Republican nomination.
At one point during the speech, it seemed like Cruz was going to endorse his former rival, but then didn't.
Cruz tried to link arms with Republicans at the party's national convention Wednesday but was booed lustily by delegates when he ended his speech without offering Trump his endorsement or even saying he would vote for the NY billionaire.
Speaking to the New York Times, Mr Trump said the U.S. would only come to the aid of allies if they fulfilled their obligations to America. Florida Sen. Marco Rubio appeared by video, delivering brief remarks more directed at electing a Republican this fall than electing Trump.
The more cautious strategy would have been to endorse Trump as some others have done this week, because if Trump loses by a small margin, Cruz could find himself with even fewer friends in the party than he has now, as many Republicans would no doubt argue that his personal petulance and anger toward Trump contributed to a narrow loss.
On the second day there was a convention floor fight over rules that was driven by anti-Trump forces and Cruz loyalists. "You know, Vladimir Putin isn't being nice to me, I'm not going to return his phone call?"
"This man is a pathological liar", Cruz said of Trump at a press conference in May.
"Senator Cruz, a strict constructionalist, chose not to accept the strict terms of the pledge that he signed.So as far as the contract was concerned, he was the one in violation - not anyone else" Manafort said. He spoke of almost four in 10 African-American children living in poverty, and 43 million people on food stamps.
Paul Manafort, Mr Trump's campaign chair, called the popular governor of this key general election swing state "petulant" and "embarrassing to his party in OH".
In many ways, it was a perfectly symbolic moment in an increasingly chaotic and disorderly convention.
"In this race for the White House, I am the law and order candidate", Trump said.
On Wednesday, leading Republicans filling out the primetime lineup sent mixed messages to delegates and television viewers alike.
Instead he lived up to the "Lying Ted" label Trump had hung on him by weaseling out of the pledge he'd made to support the primary victor.
He also went on the offensive against Democratic candidate Hillary Clinton.
"To those listening, please, don't stay home in November", Cruz said.
"Toward the end, where the other speakers would say, 'This is why we need Donald Trump, ' he just said, 'Vote for your conscience, '" Nancy Weres, a California delegate sitting in a particularly vocal section of the stands, told me.
When the crowd turned on Texas Sen.
Anyone who expected Cruz to apologize for or amend his nonendorsement knows absolutely nothing about Ted Cruz.
In an interview with the New York Times, Trump made it crystal clear: He is risky - to America, and to its allies. But for those of us watching to see whether Trump could bring a badly fractured party and country together, it was a disaster.
Ivanka Trump is Donald Trump's daughter from his first marriage to Ivana Trump. Weber said he had spent a troubling week in Cleveland processing the "wreck" that the party had become in meetings with operatives, donors and lobbyists. He predicted a "disaster" if Trump became the party's nominee. "Neither he nor his campaign has taken back a word of what they said about my family". If he had explained why he couldn't endorse Trump and explained why, then the crowd might have protested but at least he would have retained some credibility.
However, there are a handful of Republicans in the primary who have refused to back Trump - and who did not show up to the RNC to snub Trump. He did say he would not vote for Clinton.
"So, to paraphrase Ted Cruz, if you want to protect the Constitution of the United States", Gingrich continued, "the only possible candidate this fall is Trump".
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