Senate Republicans "will begin learning about some key potential retirements after recess, with the first in a series of decisions that will loom large over how the 2010 Senate battlefield takes shape," reports The Hill.
Sen.Tom Coburn (R-OK) announced he'll make his political plans known on June 1.
Sen. Jim Bunning (R-KY) seems like he'll retire but he's highly unpredictable.
Sen. Mel Martinez (R-FL) could leave office early.
Sen. Kay Bailey Hutchison (R-TX) is likely to resign to focus on a gubernatorial bid.