After failing to endorse Donald Trump in his speech at the Republican National Convention, Ted Cruz was booed off the stage Wednesday night in Cleveland. Cruz dropped out of the presidential race at the beginning of May.

Cruz encouraged voters not to stay home in November, however, instead of endorsing Trump, he said, “Stand, and speak, and vote your conscience, vote for candidates up and down the ticket who you trust to defend our freedom and to be faithful to the Constitution.”

According to the National Review, things only got worse from there. Amid the booing from the crowd, which included the New York delegation, Cruz attempted to finish the remaining paragraphs of his speech, but was drowned out. “The booing grew louder and nastier, and in response, pockets of Cruz loyalists began shouting back at the antagonists,” the National Review article reads.

In September, the Republican presidential candidates were asked to sign a loyalty pledge in an effort to prevent Trump from a third-party run. By signing the document, candidates pledged their support to the eventual nominee. According to the Washington Post, the pledge read:

“I [name] affirm that if I do not win the 2016 Republican nomination for president of the United States I will endorse the 2016 Republican presidential nominee regardless of who it is,” reads the document. “I further pledge that I will not seek to run as an independent or write-in candidate nor will I seek or accept the nomination for president of any other party.”

The only point at which Cruz even mentioned Trump’s name was to congratulate him on winning the nomination, according to Vox. Once attendees realized there was no endorsement coming from Cruz, any cheering that was coming from the crowd turned to booing and shouting, “We want Trump!” repeatedly. Trump acknowledged his former rival on Twitter, saying he had previous knowledge of what Cruz was going to say, but he let him speak anyway.

Thursday morning, Cruz addressed what had occurred at the RNC, but remained defiant. According to the Associated Press, Cruz said, “I’m not going to get into criticizing or attacking Donald Trump, but I’ll give you this response: I am not in the habit of supporting people who attack my wife and attack my father.” He also said he would not act as “a servile puppy dog” and support Trump, explaining that the pledge was “not a blanket commitment.”

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