This is what Clark said:
CLARK: I think there was an immediate determination right after 9/11 that Saddam Hussein was one of the keys to winning the war on terror. Whether it was the need just to strike out or whether he was a linchpin in this, there was a concerted effort during the fall of 2001 starting immediately after 9/11 to pin 9/11 and the terrorism problem on Saddam Hussein.
RUSSERT: By who? Who did that?
CLARK: Well, it came from the White House, it came from people around the White House. It came from all over. I got a call on 9/11. I was on CNN, and I got a call at my home saying, “You got to say this is connected. This is state-sponsored terrorism. This has to be connected to Saddam Hussein.” I said, “But—I’m willing to say it but what’s your evidence?” And I never got any evidence. And these were people who had—Middle East think tanks and people like this, and it was a lot of pressure to connect this and there were a lot of assumptions made. But I never personally saw the evidence and didn’t talk to anybody who had the evidence to make that connection.
Notice that Clark said the "concerted effort...to pin 9/11 and the terrorism problem on Suddam Hussein" came from the White House, people around the White House, and "all over". He didn't say the phone call came from the White House. (It wouldn't make much sense for him to say that the call came from "all over".)
I'm not saying he isn't a liar, (he does want to become a politician), but at least he didn't lie about a "call from the White House".