Sen. John Cornyn (R-Texas) is the big prize in the quest for more than 70 votes for immigration reform, but the Gang of Eight is split over whether he’s worth wooing.

Cornyn told Republican colleagues at a meeting Wednesday that he would consider making changes to his amendment to bolster the border-security provisions of the Senate bill.

His willingness to negotiate left some Republicans convinced after the meeting that he would strike a deal with the Gang of Eight and vote for final passage. His support would help the legislation pass overwhelmingly.

Republican members on the Gang of Eight think he is a gettable vote, even though they acknowledge some of their Democratic colleagues are skeptical. Democrats strongly doubt Cornyn will vote “yes,” given his past record of opposing immigration reform plans.