"I'm not going to comment on an internal staff meeting," Sanders said when asked if Sadler is still employed by the White House.
"I'm not going to get into the back and forth because, you know, people want to create issues of leaked staff meetings," Sanders said.
Sanders later clarified that Sadler still works at the White House.
Earlier Friday, McCain’s daughter Meghan, a co-host on ABC's "The View," took a thinly-veiled swipe at the White House, saying “I don't understand what kind of environment you're working in when that would be acceptable and then you could come to work the next day and still have a job.”
Sanders was asked repeatedly if President Trump bears responsibility for setting the tone in the White House.
"The president, as I mentioned just a moment ago, supports all Americans. If you look at what he's doing every single day, he's showing up to work, he's working hard to make this country better," said Sanders. "That is what our focus is."
"People have wondered when decency would hit rock bottom with this administration. It happened yesterday," Biden said.
McCain’s wife, Cindy, tweeted at Sadler on Thursday, writing, “@kellysadler45 May I remind you my husband has a family, 7 children and 5 grandchildren.”
CIA director nominee Haspel weighed in with a statement Thursday night, saying "I have the utmost respect for Sen. McCain and I appreciate the thoughtfulness with which he has approached this nomination process.”
The White House issued a statement Thursday: "We respect Sen. McCain’s service to our nation and he and his family are in our prayers during this difficult time.”
Sadler’s comments followed disparaging remarks made earlier in the day by a retired three-star general and guest of Fox Business Network who said McCain’s opposition to Haspel becoming CIA director was because torture "worked" on McCain "The fact is John McCain – it worked on John," retired Air Force Lt. Gen. Thomas McInerney told host Charles Payne. "That’s why they call him ‘Songbird John.'"
A Fox Business spokesperson confirmed to ABC News that McInerney will no longer be invited to appear as a guest on either Fox Business Network or Fox News Channel.
The confirmation vote for Haspel could be close.
In a statement Wednesday evening, McCain said he believes Haspel is a “patriot who loves our country and has devoted her professional life to its service and defense.”
“However,” McCain continued, “Ms. Haspel’s role in overseeing the use of torture by Americans is disturbing. Her refusal to acknowledge torture’s immorality is disqualifying.”
He added: “I believe the Senate should exercise its duty of advice and consent and reject this nomination.”
ABC News' Elizabeth McLaughlin, Luis Martinez, and Shah Rahmanzadeh contributed to this report.