Cruz, who suspended his White House run last week, said he does not expect to win Nebraska's primary but is leaving the door open.
"We launched this campaign intending to win. The reason we suspended our campaign was that with the Indiana loss, I felt there was no path to victory," he said Tuesday on conservative host Glenn Beck's radio program.
"If that changes, we will certainly respond accordingly."
Cruz demurred on supporting Trump, the presumptive GOP presidential nominee, because the Republican National Convention and general election are still months away.
"This is a choice every voter is going to have to make. I would note, it's not a choice we as voters have to make today," Cruz said when asked about supporting Trump.