LONDON — Britain will roll out a supersized royal welcome for Donald Trump’s unprecedented second state visit on Wednesday, with the king to greet the U.S. president who has compared himself to a monarch.

From a carriage ride with King Charles III to a flypast and a lavish state dinner in the nearly 1,000-year-old Windsor Castle, Britain is going to unprecedented levels to dazzle and flatter the mercurial Trump.

A huge security operation will keep the 79-year-old Republican far away from protests and the British public — among whom polls show Trump remains unpopular — with the extraordinary show of pomp and pageantry unfolding entirely behind closed doors.

It’s all designed to appeal to a U.S. leader who this year crowed “LONG LIVE THE KING!” about himself on social media before the Whi

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