The group known as the America Irish State Legislators Caucus will attend several events later.
A delegation of US politicians will visit Stormont later to meet representatives from the main Northern Ireland parties.
Current and former Democrat and Republican senators and members of Congress from across 44 states are expected to be there.
The government told peers it would bring forward amendments including "a more robust process" around immunity from prosecution
Danmark Seneste Nyt, Danmark Overskrifter
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