From TPM:

...

In any case, there's a high bar for testimony from a National Security Advisor. But it's happened before. And more than once. If they wanted her to testify, she could testify. What they want is for her to be able to lacerate her critics, discuss whichever parts of her advice to the president would be helpful to her politically at the moment, and freely declassify documents which she or the White House believes will hurt her enemies.

She's a veritable information geyser, a one-woman-FOIA. She just won't answer questions under oath.

-- Josh Marshall