Executives from Facebook, Alphabet Inc’s Google and Twitter will appear in the US Congress in the coming weeks as lawmakers probe Russia’s alleged interference in the 2016 US election, committee sources said on Wednesday.

A Senate aide said executives from the three firms had been asked by the Senate Intelligence Committee to testify at a public hearing on Nov. 1.

The leaders of the House of Representatives Intelligence Committee said the panel would hold an open hearing with technology companies as part of its investigation.

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