According to David Irving's book Hitler's War & the War Path, Hitler regretted supporting Franco in the Spanish civil war and liked the Republicans better because they were "socialists" and could be made into "good national socialists" later.

The quote:

"Early in November 1937 Hitler told his staff that an outright Franco victory in Spain was not desirable: ‘Our interest is in maintaining existing tensions in the Mediterranean.’ That Franco was fighting the Communist-backed Republicans was of only secondary importance. In April 1938 Hitler would muse out loud to Reinhard Spitzy, Ribbentrop’s private secretary: ‘We have backed the wrong horse in Spain. We would have done better to back the Republicans. They represent the people. We could always have converted these socialists into good National Socialists later. The people around Franco are all reactionary clerics, aristocrats, and moneybags — they’ve nothing in common with us Nazis at all!""

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A Jewish State Full Audiobook by Theodor Herzl
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The Jewish connection was mentioned many times on this radio show

Adolf Hitler - Founder of Israel