[compman775]

A bill can actually become law without the president's signature. If the president does not sign it or veto it after Congress passes it, it becomes law eventually (IIRC). Also, congress can override a presidential veto. (I don't know if an executive decision could override that.)

[shadowfiend]

Congress can override a presidential veto with a 2/3 vote of both houses. That cannot be overridden by executive power.

After 10 unsigned days, excluding Sundays, bills become law, unless Congress adjourns before the 10 days expire, at which point it is automatically vetoed—the so-called “pocket veto”: http://en.wikipedia.org/wiki/Pocket_veto

[king_magic]

That's true. But, again, though - that requires Congressional action, and Congress is most decidedly not part of the executive branch of the US government. My point is that this is a Congressional (legislative branch) issue, not a Presidential (executive branch) issue.