Robert Kennedy Jr. cemented his full devotion to Donald Trump before a raucous crowd of adoring supporters in Arizona Friday evening, finalizing his defection from the Democratic party.

The nephew of Democratic President John F. Kennedy joined the former president on stage to a barrage of raucous cheers.  

The Trump campaign previously announced a 'special guest' would attend the rally, and the mysterious allure drew thousands to the Desert Diamond Arena - capacity nearly 20,000 - in Glendale, Arizona. 

Earlier in the day in Phoenix, Kennedy pushed supporters who live in 10 swing states to back Republican nominee Donald Trump, but said his name would remain on the ballots in traditional red or blue states. 

'Tonight I am very pleased to welcome a man who has been an incredible champion, Trump said of Kennedy. 'We're both in this to do what's right for the country.'

'Bobby! Booby! Bobby!' the crowd erupted in cheer. 

'I don't think I have ever introduced anyone that has gotten the applause he got,' Trump said, still in control of the audience. 

He then launched some new policy ideas with Kennedy in mind.

'In honor of Bobby .. I will establish a new independent commission on assassination attempts,' Trump - an assassination survivor himself - said.

The panel would also investigate Trump's July 13 shooting in Butler, Pennsylvania. 

'And we will release all the documents pertaining to the assassination of President John F. Kennedy.' 

'I have never had more people ask me, please, sir, release the documents on the Kennedy assassination, and we're going to do that,' he said.

The former president then lauded the Kennedy heir for his environmental efforts - and he said he would appoint the independent candidate to an ecological study panel to examine the effects of climate change.

Then he turned over the microphone.

Kennedy began talking about the things he and the former president both believe in. 

'We're spending billions in Ukraine and we could use that money back here in the United States,' Kennedy said. 'Don't you want a president whose going to get us out of the wars?' 

He then spoke about censorship - something he has said has been a major issue for his campaign as a third party candidate, calling it 'the first step to totalitarianism.'

The former Democrat also touched on making American foods less processed and unhealthy.' 

'President Trump is going to make America healthy again!' Kennedy concluded his remarks.

'Wow,' Trump remarked regaining control of the podium, who explained that the two had long been friends. 

He also floated a new policy after seeing demonstrators burn U.S. flags at protests in Chicago for the Democratic National Convention. 

'They outta make it illegal to burn the American flag,' Trump said, before suggesting a new law. 

'You burn the American flag, you go to jail for one year,' he said to cheers. 

The ex-president also bashed Vice President Kamala Harris's campaign - ripping her border policies. 

'325,000 migrant children are missing, they are gone,' he said. 'She allowed them to be trafficked into this country.' 

'They will never see their homes or parents again,' he said. 

'Kamala has set loose thousands of Venezuelan gang members.' 

'She supports deadly sanctuary cities,' he continued on about the Biden-Harris immigration policies. 

'I look forward to the debate.'