Within the campaign, some are turning to the question of what’s next. One senior aide said there had been no discussion about dropping out before the final primary contests are held on June 7 but noted that Cruz wouldn’t be eager to prolong a campaign he was convinced he couldn’t win.

Many top figures in the party are convinced that a loss on Tuesday would be, for all intents and purposes, the end of the road. “A Cruz loss in Indiana means lights out,” said Scott Reed, the chief political strategist for the U.S. Chamber of Commerce. “Game, set, match.”

The private angst within the campaign stands in stark contrast to public statements from Cruz himself, as the candidate showed no hint of concern in an appearance before the California Republican Party convention here on Saturday…

Cruz is also likely to face growing pressure from party leaders, many of whom are eager to begin the process of uniting a divided party ahead of what will be a challenging general election. In recent days, several state party chairs have held private discussions about rallying behind Trump if he wins on Tuesday.