A working group of 13 Republican senators will draft the Senate's version of legislation to repeal and replace Obamacare.

Senate GOP leadership won't confirm the names on the list, but individual offices have revealed its members.

The panel is made up mostly of the chairmen and members of the three committees that have jurisdiction over healthcare, and also includes Republican leadership.

There are no women on the panel, which has already led to some criticism from Democrats.

The list also excludes Sens. Susan Collins, R-Maine, and Bill Cassidy, R-La., who have written their own healthcare bill that would give states the option of auto-enrolling residents in a basic health and pharmacy plan.

Senate Majority Leader John Cornyn, R-Texas, who is in the group, said Collins and Cassidy have been "an integral part of the discussions so far."

Here's the list: