Also on Sunday with Laura Kuenssberg, Labour's Pat McFadden says the PM has made a mistake but acted in "good faith" over the appointment of Mandelson.
Senate Majority Leader Chuck Schumer says the new legislation would end "statute of limitation barriers" - the deadline to file a lawsuit.
Meanwhile, No 10 says the PM has "full confidence" in chief adviser Morgan McSweeney, despite pressure over the 2024 appointment of Lord Mandelson as US ambassador.
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