More likely, Bush's strategy is to do what he thinks is good for the nation, not the party. But I shouldn't expect the Left to wander into that thought process.
And he thinks that for the nation the glory and greatness is the best.
As Machiavelli demonstrated, a state which wants to become an empire needs to import many people. These republics which want to remain free and stable for a long time should emulate Sparta or Venice, but they have to forego the hegemony and imperial glory.