[Ultra Sonic 007]

The president’s required signature on the bill “would obviously be synonymous with his authority to execute a pardon,” he said. “The Congress is doing nothing more than initiating a pardon.”

Without the President's signature, it's nothing more than paper.

[Smokin' Joe]

I believe (I am not an attorney, so I may be wrong) that while the Congress could pass a resolution expressing collective desire to see the agents pardoned, they are incapable of doing so, even if they were to override a veto.

However, this turns up the heat a little and more or less puts pressure on Congress and candidates for POTUS in 08 to take a side or a stand, and perhaps even for the President to do something.

It calls the question on a seminal aspect of the border issue, that of defending the border (and our agents) using deadly force,