The terms of their employment with the CIA would put the kibosh on that; unless they would prefer spending a lot of time in the stony lonesome.
Yes...
...if they come back stateside.
But if they head overseas, well... I doubt that China or Russia would be very welcoming of our police agencies seeking to arrest them. Edward Snowden already showed that.
And our current reaction to Snowden and Russia and Assange shows that the GOP is very happy with Americans with classified knowledge heading overseas to find work.
Which means that Congress and the President, at the current time, wouldn't really stop them... until they decide to change their mind on this issue.