Mr McCain, 81, had indicated he opposed the nomination of now CIA Director nominee Gina Haspel over her role in enhanced interrogation techniques under president George W Bush. Meghan McCain, the senator's daughter, said that Sadler called her to say she was sorry and promised to apologize publicly as well, but never did.
Controversial White House aide Kelly Salder is no longer working at 1600 Pennsylvania Ave, but the details over her job separation remain murky.
It's unclear if Mrs. Sadler resigned or if she was sacked on Tuesday, but Mrs. Conway suggested Mrs. Sadler's comments about Mr. McCain would not preclude her from other jobs within the administration.
Trump blasts Mueller's spending on Russian Federation probe
Negotiations between Trump's lawyers and the special counsel on a possible interview have continued ever since. Trump has argued that the claims predate Manafort's involvement with his Republican campaign.
McCain, 81, was the 2008 GOP nominee for president and is now being treated for a form of brain cancer that is frequently deadly. It is unclear whether Sadler was sacked or resigned.
"Yes, there are other administration jobs open to her and to others who would like to interview for those jobs", Conway responded when asked whether Sadler would be considered for other positions.
White House aides are reportedly looking for leakers and considering ousting more people from the communications staff in order to prevent conversations from leaving their meetings.
The White House refused to condemn the remarks in the aftermath, but White House Press Secretary Sarah Huckabee Sanders told staffers that the comment was inappropriate but shouldn't have been leaked to the media.