It depends on which terrorist you're talking about

Seymour Hersh is always right:

In the past six months, Israel and the United States have also been working together in support of a Kurdish resistance group known as the Party for Free Life in Kurdistan. The group has been conducting clandestine cross-border forays into Iran,
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(The Pentagon has established covert relationships with Kurdish, Azeri, and Baluchi tribesmen, and has encouraged their efforts to undermine the regime’s authority in northern and southeastern Iran.) The government consultant said that Israel is giving the Kurdish group “equipment and training.” The group has also been given “a list of targets inside Iran of interest to the U.S.” (An Israeli government spokesman denied that Israel was involved.) (emphasis added)

So, in a nutshell, Israel and the United States are funding terrorist activity in Iran. But, oh:

Such activities, if they are considered military rather than intelligence operations, do not require congressional briefings. For a similar C.I.A. operation, the President would, by law, have to issue a formal finding that the mission was necessary, and the Administration would have to brief the senior leadership of the House and the Senate.

So, once more we have the Imperial Presidency. Or, more euphemistically, the Unitary Presidency. Once more no Congressional oversight which is very clearly stated in our Constitution (which, I am sure, Bush has never read.)

It is ironic that most of the founders of our country were Deists, or, close to being Unitarian. We have come full circle, except it isn't about being a good man. It is the opposite.

And one more thing, if you didn't think the above was ironcial enough:

The view that there is a nexus between Iran and Iraq has been endorsed by Condoleezza Rice, who said last month that Iran “does need to understand that it is not going to improve its own situation by stirring instability in Iraq,” and by the President, who said, in August, that “Iran is backing armed groups in the hope of stopping democracy from taking hold” in Iraq. (emphasis added)

Now if Iran was arming Zapata, that would be a different story, wouldn't it. Insurgent activity in South Texas doesn't sound so nice.