With pressure mounting over the Veterans Affairs scandal,
But while McDonough voiced confidence in embattled
Shinseki is facing numerous calls to step down amid complaints about long waiting times for treatment at VA medical facilities in several cities and attempts by VA employees to cover up the delays.
"Gen. Shinseki continues to work this every single day," McDonough told CBS News' White House Correspondent Major Garrett on "Face the Nation." "And he will continue to work these issues until they're fixed."
Asked by Garrett if Shinseki had the "full confidence" of the president, McDonough avoided the question, saying only that Obama expected the VA chief to continue working to address the problems.
McDonough emphasized Obama's anger and said the president was personally engaged.
"The president is madder than hell, and I've got the scars to prove it," he said. "We're going to get to the bottom of those things, fix them and ensure that they don't happen again."
Last week, Shinseki testified before Congress that he was "mad as hell" over reports of excessive waiting times for veterans and falsification of records.
McDonough said the White House has deployed additional staff at the VA to examine whether the problems are a "series of isolated cases or whether this is a systemic issue that we need to address with wholesale reform."
Later in the program,