Texas Senator Ted Cruz refused to endorse Donald Trump during his speaking slot at the Republican National Convention on Wednesday night, and the hall at the Quicken Loans Arena descended into chaos soon after.While Cruz congratulated Trump on winning the primary, he declined to directly endorse the Republican nominee. Instead, he told voters to vote their conscience, and the advice was not well received. The crowd loudly booed Cruz as he finished his speech then walked off the stage.Crowd boos @tedcruz as he declines to endorse @realDonaldTrump pic.twitter.com/nqLaVey8mp  POLITICO (@politico) July 21, 2016Video surfaced of former Virginia attorney general Ken Cuccinelli, part of the  Never Trump  movement, escorting Cruz s wife Heidi off the convention floor as Trump supporters yelled insults at her.Angry Ken Cuccinelli escorting Heidi Cruz out as Trump supporters yell at her pic.twitter.com/G6USuhoSx2  Graham Moomaw (@gmoomaw) July 21, 2016Trump and Cruz have had an acrimonious relationship for months as they were the final two viable candidates in the Republican Primary. Cruz and his campaign often out-maneuvered the incompetent Trump team in its fights for delegates, while Trump used the unusual tactic of re-posting a tweet that attacked Cruz s wife Heidi for her looks.Trump took to calling Cruz  Lyin  Ted  and the two men verbally battled with each other for weeks trading insults and attacks.In response to Cruz s non-endorsement, Trump insiders called him  classless  according to Fox News.It is widely believed that Cruz is setting himself up to run for president in 2020 after a likely loss by Trump in this year s elections. While he is unpopular with the Republican establishment who has often criticized him for his outrageous statements and Senate stunts like filibusters that helped to shut the government down, Cruz is popular with the so-called  religious  right, who calls him one of their own. His opposition to issues like abortion and same-sex marriage, as well as his strident opposition to diplomacy in the Middle East, helped him win the Iowa Caucus earlier in the year.Featured image via Twitter