This is starting to get easy.

Why have Don McGahn testify?

Jones Day law firm ?

Did work for businesses belonging to Russian oligarchs including:

Oleg Deripaska

Vicktor Veckselberg

Alexander Mashkevich

Or possibly because he worked for Freedom Partners (funded by Koch brothers)?

Or even still that he served as a member of the Federal Election Commission from 08 - 13?

Nothing to see here.

Go ahead and put him under oath.

How do you legally introduce evidence?

(all pics Wikipedia)