We've skipped a bit of the movie...This is when Magneto has Sen. Kelly in the mutant chamber.

Magneto
(spoken) Kelly - now that you're here, I've decided to
make you my new project.

Sen. Kelly
(spoken) You really don't have to do that.

Magneto
(spoken) I know. That's what makes me so smart.
(sung) Whenever I see someone
Less powerful than I
(And let's face it - who isn't
Less powerful than I?)
My good brain
Tends to be quite sane
And when the world needs a makeover
I simply have to take over
I know I know exactly what it needs
And even in your case
Though it's the toughest case I've yet to face
Don't worry - I'm determined to succeed
Follow my lead
And yes, indeed
You will be:

Tolerant!
You're gonna be Tolerant!
I'll teach you the proper ploy
Even though you're a Goy
Little things to say and do
I'll show you what weapons to wear
How to fix Sabertooth's hair
And then through and through

You'll be Tolerant
I'll help you be Tolerant!
You'll hang with the right cohorts
You'll help us repair our forts
Know the people you've got to know
So let's start
'Cause you've got an awfully long way to go:
(The machines starts)

Don't be scared by my frank analysis
Think of it as genetic dialysis
Now that I've chosen to be come a pal, a
Brother and adviser
There's nobody wiser
Not when it comes to Tolerant-
I know about Tolerant
And with an assist from me
To be who you'll be
Instead of racist who-we-got
There's nothing that can keep you
From becoming Tolerant-raunt

Ha ha ha ha
We're gonna make
You Tolerant

When I see depressing creatures
With unmutated features
I remind them on the mutant behalf
To think of
Celebrated heads of state or
Specially great communicators
Did they have brains or knowledge?
Not next to me!

They were Tolerant! Please -
It's all about Tolerant!
It's not about aptitude
It's the way you view
So it's very shrewd to be
Very very Tolerant
Like me!

(He climbs off the machine)
(spoken, weakly) Why, Mr. Kelly, look at you. You're a mutant.

Sen. Kelly

(spoken) I - I have to get out of here!

(Sabertooth carries him off)

Magneto
(spoken) You're welcome!
(sung) And though you protest
You're 'genetically best'
I know clandestinely
You're gonna grin and bear it
Your new found Tolerant-ity
Ah!

Ha ha ha ha
You'll be Tolerant-
Just not as quite as Tolerant
As me!
(Spoken) After all, I'm letting you live.