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The fact that Cruz spoke at all came as a surprise to some considering how bitter the primary campaign became towards the end.

\"PHOTO:Alternates
David Maxwell/EPA
PHOTO:Alternates and guests react as Texas Senator and former Republican presidential hopeful Ted Cruz speaks during the third day of the 2016 Republican National Convention at Quicken Loans Arena in Cleveland, July 20, 2016.
>

At one point, Trump insinuated that Cruz's wife Heidi was less attractive than his own wife Melania, and later he made suggestions that Cruz's Cuban father was somehow connected to the assassination of President John F. Kennedy.

He also questioned whether Cruz was eligible to run for the presidency because he was born in Canada.

Shortly after Cruz exited the stage to a growing round of boos, Trump entered the arena on the opposite side to sit with his family and watch his son Eric address the crowd.

Cruz turned to Twitter to reiterate his main point, not mentioning Trump:

If we stand together and choose freedom, our future will be brighter. We can do this. #RNCinCLE

— Ted Cruz (@tedcruz) July 21, 2016

To those listening, please don't stay home in November. If you love our country, stand and speak and vote your conscience #RNCinCLE

— Ted Cruz (@tedcruz) July 21, 2016

ABC News' Katherine Faulders contributed to this report.

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