Suggestions by @kipwalker

Will Smith

as Barack Obama in Trump

Adam Driver

as Castor Troy in Face/Off

Emma Thompson

as Minerva McGonagall in Harry Potter

Seth Rogen

as Fred Flintstone in The Flintstones

Anna Kendrick

as Dru Anderson in Strange Angels

Carey Mulligan

as Marion Crane in Psycho

Laura Linney

as Hillary Clinton in Celebrity Biopics

Tina Fey

as Sarah Palin in Celebrity Biopics

Annette Bening

as Elizabeth Warren in Celebrity Biopics

Jeff Bridges

as John Wayne in The Dean Martin Celebrity Roast

Danny DeVito

as Don Rickles in The Dean Martin Celebrity Roast

Denis Villeneuve

as Director in Aliens

Clive Owen

as Declan Ross in The Isle Chronicles

John Lithgow

as Senator Wingwoah in The best little whorehouse in texas

Annette Bening

as Margaret White in Carrie

Zac Efron

as Adult Josh Baskin in Big

Oscar Isaac

as Stanley Kubrick in Celebrity Biopics

Jason Segel

as Jim Henson in Celebrity Biopics

Jon Hamm

as Sean Archer in Face/Off

Ralph Fiennes

as Schmendrick in The Last Unicorn