Vale of Glamorgan MP Alun Cairns has said that the Argentine foreign minister compared Britain's control of the Falkland Islands to Israeli settlers in the West Bank.
Mr Cairns said he found the comparison, which was made during a meeting of the all-party group on Argentina, "offensive" and "pretty outrageous".
More top news
Eleven police officers are under criminal investigation over their handling of child sex abuse allegations against Lord Janner.
Elena Veronica Ciochina left her home in Newham on Saturday night and hasn't been seen since.
Sarah Champion quit in June as 172 Labour MPs backed a vote of no confidence in the party leader - but she has now asked for her job back.