It’s all in for Rep. Beto O’Rourke in his bid to unseat Sen. Ted Cruz. The El Paso Democrat said that if he loses to Cruz, he won’t run again.

"We're all in on this," O’Rourke told Capital Tonight anchor Karina Kling in a Tuesday interview. "The moment's too important and the country needs us to win."

O’Rourke is confident he can beat the Republican incumbent in red Texas. He’s been consistently gaining in polls and packing town halls. But it’s still an uphill battle. Still, some political experts have said even if O’Rourke comes close to Cruz, his national attention this election cycle could position him for a run for higher office. O’Rourke said he’s not interested.

“Not in the slightest interested at all.”

Cruz’s campaign has launched a number of negative attack ads against O’Rourke. O’Rourke said his campaign will stay positive from here until Election Day.

Both Cruz and O’Rourke have also been going back and forth on a debate schedule. One proposed for Friday is not happening. O’Rourke said the two campaigns couldn’t agree on the terms and criticized Cruz for wanting to face-off on Friday nights. Cruz said it’s because the Senate is in session.

"He's missing votes in the Senate right now to be campaigning in Texas," O’Rourke said. "So listen, if he can't do weekdays, perhaps we can do this on a Saturday or Sunday, but one way or another we're going to find a way to do this."