Newton Wallop, 6th Earl of Portsmouth JP, DL (19 January 1856 – 4 December 1917), styled Viscount Lymington until 1891, was a British Liberal politician but then joined the Liberal Unionist Party in 1886.
He later switched back to the Liberal Party to serve as Under-Secretary of State for War under Sir Henry Campbell-Bannerman from 1905 to 1908.
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