Destroy All Humans!

Thanks for the shield tip. Having that 3rd shield upgrade made it ridiculously easy.

I only had about half of each branch filled when I fought the robot prez. It was actually challenging and fun! Once I unlocked a few more talents, it was just too easy and finished quickly.
My Protips for him (silhouette detailed in For the Glory of the Furon Empire! achievement):
Maintain death ray on chest while avoiding volleys or sprays by staying ahead or moving up/down.
If necessary, drain nearby cars/mini mechs while he uses the laser beam.
In phase two, there will be 3-4 mini mechs to drain if needed.
You can effectively ignore the ballon air mines or use sonic boom on the capital building behind them to blow them all up at once.
In phase one he only shoots two missiles at a time.
In phase two he shoots three.
In phase three, he shoots four missiles at a time.
While it is helpful to have repulse-a-tron maxed out, it can be done without it.
It’s worth it more imo to have transmog and the quantum deconstructor for the saucer maxed because it also disrupts the roboprez’s attacks.