INDIANAPOLIS — Republican Ted Cruz faces a high-stakes test for his slumping presidential campaign in today’s Indiana primary, one of the last opportunities for the Texas senator to halt Donald 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 retired technology executive Carly Fiorina as his running mate. Yet his aides were pessimistic heading into today’s voting and were prepared for Cruz to fall short, though the senator 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 during a campaign stop.

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.