Here are Sen. Ted Cruz's (R-Tex.) full remarks at the 2016 Republican National Convention, during which he called for a "return to freedom" and urged voters to "vote their conscience" in November. (The Washington Post)

CLEVELAND — The bitterest rivalry of the Republican primaries ended on Wednesday night, as Sen. Ted Cruz took the podium at the party’s convention and congratulated Donald Trump “on winning the nomination” — but did not endorse him.

“Vote your conscience,” Cruz said. “Vote for candidates up and down the ticket who you trust to defend our freedom and to be faithful to the Constitution.”

As it became clear that Cruz would not endorse Trump, many in Quicken Loans Arena booed. There were shouts of “honor your pledge!” at pro-Cruz delegates, and heckles of Cruz’s wife Heidi, who was escorted off the floor. Before Cruz had finished speaking, Trump himself emerged and walked down to the VIP box, applause for him mixing with boos for Cruz, and nearly drowning out the  senator from Texas.

“I can’t believe he didn’t endorse Trump,” said Cecilia Cdebaca, a Trump delegate from New Mexico. “Maybe Donald Trump was right. Maybe he is Lyin’ Ted. Maybe he picks the Bible up and maybe he puts it down and then he lies, because any Christian would forgive.”

The boos and taunts reopened the wounds of the primary, in which a sort of non-aggression pact between Trump and Cruz — who once called the nominee “terrific” — ended in acrimony and name-calling. In the final month of the primaries, Trump retweeted mockery of Cruz’s wife, speculated that his father was involved in the JFK assassination and repeatedly called the senator a liar. Cruz called Trump “utterly amoral” and “a serial philanderer,” and spent the next two months saying he would have trouble endorsing him.

Cruz walked on the stage Wednesday night knowing that his refusal to bury the hatchet could lead to a scene on the floor, according to Republicans familiar with his thinking.

The tension was visible earlier in the day, when Cruz — unique among defeated candidates — held a “thank you” rally a mile from the convention itself. The line to get in stretched across a parking lot, with more than a thousand hopeful conservatives wearing football-style “Cruz 45” jerseys and carting copies of the senator’s memoir for him to sign.

And they split on whether he should officially endorse the Republican nominee. Hyman Drusin, a New Yorker and  candidate for office, had scrawled “2020” over the “2016” on his Cruz campaign button. He intended to write in Cruz for president and hoped that Cruz would not endorse Trump.

“I saw Manafort on TV, saying, ‘This isn’t the Republican Party, this is the Trump party,’ ” Drusin grumbled, referring to Trump’s campaign manager. “That’s what he thinks of party unity. Why should Ted endorse that?”

Dick Black, a Virginia state senator and pro-Cruz delegate, said that the holdouts needed to get behind Trump’s candidacy. That included holdouts like Cruz, who surely understood the threat of radical Islam and the way a new President Clinton would enable it.

“I think he’s gonna support Donald Trump,” he said. “It would be a huge mistake if he didn’t.”

Indeed, he didn’t — and cut a different path than Ronald Reagan, a political role model. Cruz opted not to release his delegates, allowing him to say that he’d won more support from the floor than any losing candidate since Reagan in 1976. But Reagan endorsed President Gerald Ford, and campaigned for him, while Cruz would not be doing that for Trump.

“You’ve got to get to one step before you make the second,” Cruz’s campaign manager Jeff Roe explained before Cruz’s lunchtime speech for delegates. “Ted’s going to spend a lot of time and resources campaigning in races he’s already been involved in.”

That was a reference to Senate and other down-ballot races, not the presidency. Since the end of the presidential race, Cruz has already backed one Senate candidate — Colorado’s Darryl Glenn — who worried the state’s political establishment but won over conservative activists.

Cruz’s presidential bid also ended with close to $10 million unspent, money that will allow him to travel across the country, and stage events like Wednesday’s, which featured a buffet spread and specially designed signs that were snatched up for souvenirs. He’s kept a close circle of campaign advisers, and made himself available to conservatives already plotting for a post-Trump 2020 election, flying to Cleveland before the convention began to meet with the secretive Council for National Policy.

On Wednesday, before taking the convention stage, Cruz framed his unsuccessful 2016 bid as a crusade — a “movement” — that had broken organizing records but fallen to the black swan candidacy of Trump.

“I don’t know what the future holds,” Cruz said at one point. Sensing a cue, members of the audience shouted “2020!”

Later, Cruz quoted the opening monologue of the Academy Award-winning biopic “Patton,” telling his supporters that they would look back on 2016 and realize they were on the right side of history.

“I feel very much those sentiments expressed by Patton, that when we are old and gray — and Caroline and Catherine, I hope you give us a passel of grandkids — we can say, we stood with the people who were fighting for this country,” said Cruz, referring to his young daughters.

But Trump could not let his defeated rival have an afternoon to himself. “Our party now has a nominee,” said Cruz.

Boos started rising from the audience, then laughter, which seemed to surprise Cruz. He turned his head to see Trump’s Boeing 757, with his name visible from a mile away, descending toward an airfield.

“That was well-orchestrated,” Cruz deadpanned.

Former Republican presidential candidate Ted Cruz can't seem to escape Donald Trump. At a rally in Cleveland, Ohio, Cruz was interrupted by Trump's plane as it flew overhead just as he was telling supporters, "our party now has a nominee." (Reuters)

Hours later, in Quicken Loans Arena, Cruz finally took the microphone back from Trump. After the pro-forma congratulation, Cruz delivered a speech designed for someone seizing his party’s nomination — someone coming into his own as a national leader. He paid tribute to Michael Smith, a police sergeant killed this month by a sniper in Dallas.

“His life was a testament to devotion,” said Cruz. “He protected the very protesters who mocked him because he loved his country and his fellow man.”

Cruz went on to endorse both Trump’s version of conservatism, and his own — everything from “a wall to keep us safe” to the abolition of the Affordable Care Act.

But in asking delegates to vote their “conscience” and saying that voters should choose candidates who could lead without “anger,” Cruz appeared to be making a swipe at Trump. When he suggested that voters needed to follow their consciences, New York’s delegation began chanting “Trump!”

“I appreciate the enthusiasm of the New York delegation,”  Cruz said, before that enthusiasm drowned out his applause.

Robert Costa and Philip Rucker contributed to this report.