I thought they were considering present CIA director Mike Pompeo to replace Tillerson, with Senator Tom Cotton to replace Pompeo at the CIA.
If this is the case, it is a gamble because there is no guarantee that whoever will replace the eminently capable Senator Cotton ( an immigration hawk ), will be a Republican. It will be a DIRTY fight like the present election in Alabama to replace Jeff Sessions.
"there is no guarantee that whoever will replace the eminently capable Senator Cotton ( an immigration hawk ), will be a Republican"