Speaking to reporters in Evansville, Indiana, on the day of the state's presidential primary, Cruz warned that the country can "plunge into the abyss" if Trump is elected president.
"We are not a proud, boastful, self-centered, mean spirited, hateful, bullying nation," Cruz said, with his wife Heidi and running mate Carly Fiorina by his side. "If Indiana does not act, this country could well plunge into the abyss."
Take a look at a portion of the rant here:
Cruz faces a high-stakes test of his presidential campaign in Tuesday's primary, one of the last opportunities for the Texas senator to halt Trump's stunning march toward the GOP nomination.
Cruz has spent the past week camped out in Indiana, securing the support of the state's governor and announcing Fiorina, a retired technology executive, as his running mate. And he's vowed to stay in the race, regardless of the results.
"I am in for the distance, as long as we have a viable path to victory," Cruz told reporters on Monday.
Trump devoted more time to campaigning in Indiana than he has to most other states, underscoring his eagerness to put his Republican rival away and shift his attention toward Democratic front-runner Hillary Clinton.
While Trump cannot clinch the nomination with a big win in Indiana, his path would get easier and he would have more room for error in the campaign's final contests.
"Indiana is very important, because if I win that's the end of it. It would be over," Trump said during a lunch stop Monday in Indianapolis.