Moving vocal phrases on a multi-track vocal to get them both to match the tempo

I have a song with two vocal tracks recorded. In places one phrase of the track is noticeably out of time, it comes in late, typically. How do I move that phrase to an earlier time in the track without moving the entire track forward and placing all of the rest of it out of time? Is there an easy way to do this?

Also, getting the vocalist back to do it over is not easy.