I hope Gregg's not stupid enough to believe any promise either That One, or Gov. Lynch would make to him. That seat would go to a Democrat in a New York minute, because the Gov. knows there would be a MAJOR political backlash if it didn't.
There’s an easy way to insure that a promise to appoint a Republican to Gregg’s seat is kept. Its been used many times before. Gregg doesn’t resign his seat until AFTER the Governor of New Hampshire has named and appointed his successor. If the Governor names a Democrat, Gregg withdraws his name from consideration.
The Republicans in the Senate can also filibuster the nomination from being confirmed as further insurance.