Look for the character to work alongside Grace Gummer's new character, Hallie Shea, a reporter embedded in the campaign.
Johnstone has also booked a gig on HBO's "Getting On" opposite Laurie Metcalfe.
In other casting news ...
Denis O'Hare will guest star on "Law & Order: Svu." O'Hare will play Father Shea, a role he originated on "Law & Order: Ci." [TV Guide]
- Chris Harnick
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