Re-entering federal politics, Roebuck was elected Liberal Member of Parliament for the Toronto riding of Trinity in the 1940 federal election after successfully challenging sitting Liberal MP Hugh Plaxton for the party's nomination.
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He lost the Liberal Party nomination in 1940 federal election to former Ontario Attorney-General Arthur Roebuck but attempted to return to Parliament in the 1945 federal election running in the riding of Kingston City where he was defeated by Conservative Thomas Kidd.