It doesn't look like C-Span is airing it, but you can stream it here. (Real Player)

Emptywheel is live-blogging the hearing at FDL.

He is discussing his refusal to sign off on the NSA wiretapping when he was acting A.G.

UPDATE: Explosive and damning stuff coming out. Per FDL:

For two weeks, according to Comey, [the NSA wiretapping program] operated outside the rule of law (though one day after the hospital visit, Bush told Comey to "do what's right," so they started to put it in line with the law).

That night, Comey and a number of other DOJ staffers prepared their resignation, refusing to stay after they had been overridden.

Comey and Robert Mueller met one-on-one, in succession with Bush the following day, and Bush eventually agreed to fix the program.

One point Comey made. The biggest reason why Comey and Mueller were able to get Bush to change the program was because Bush was willing to meet with them privately. The unstated message here is that, so long as Cheney, Addington, Card, and Gonzales were able to mediate between DOJ and Bush, they were able to persuade him to keep the program on its illegal footing.