Both parties' presidential candidates are courting Indiana voters ahead of the state’s primary Tuesday, hoping the late-voting Midwestern state will push them closer to the delegate threshold needed to win the nominations.

Republican front-runner Donald Trump is hoping to drum up even more support with a large rally in South Bend Monday at 7 p.m. EDT. A live stream of the rally can be watched for free by clicking here or by watching below.

About 12,000 people are expected to attend the really at the Century Center, the South Bend Tribune reported. Trump's GOP rival, Texas Sen. Ted Cruz, has drawn much smaller crowds while campaigning in the Hoosier State, where he needs a key primary win after Trump racked up all five Northeastern states that voted last week.

The Indiana race could prove to be a make-or-break moment for Cruz as Trump continues his march toward the 1,237 delegates needed to secure the nomination. Cruz has said he is determined to stay in the race.

Indiana Gov. Mike Pence is backing Cruz, while Trump has in his corner Bobby Knight, the Hall of Fame basketball coach who guided the University of Indiana's men's team for more than two decades.

“Indiana is so important and we have to win it,” Trump told a crowd in the state Sunday. “If we win Indiana, it's over.”

An average of Indiana polls conducted by Real Clear Politics shows Trump widening his lead ahead of Tuesday’s voting with 42 percent to Cruz’s 32.7 percent. Ohio Gov. John Kasich remains in a distant third place with 15.8 percent.

Trump is hoping to pick up the 57 Republican delegates in the Hoosier State, while there are 92 delegates up for grab on the Democratic side.