Churchill's drinking reputation and a famous retort

Was Churchill the politician credited with the retort that he would be sober the next day?

Probably, in this telling; the answer also cautions that drinking habits and political accusations complicate judgments about drunkenness.

The retort about being sober the next day is tentatively attributed to Churchill. His substantial drinking is acknowledged, while the reply argues that his tolerance and the habits of his time complicate assumptions about when he was drunk. It also warns that political opponents could use accusations of drunkenness as an attack. The attribution remains qualified rather than verified.