A Cambridge Republican candidate challenging US Senator Elizabeth Warren plans to speak at a “free-speech” rally Saturday on Boston Common. Shiva Ayyadurai, who has staked out a populist stance in the early months of the GOP primary, confirmed Monday that he planned to speak at the rally.

Shiva Ayyadurai, who has staked out a populist stance in the early months of the GOP primary, confirmed Monday that he planned to speak at the rally.

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