British ex-pat Robert Murat is being questioned as a witness by police as part of the investigation into the 2007 disappearance of Madeleine McCann.
It is understood Murat and his wife will both be questioned in connection with the case.
British police have travelled to the Algarve in Portugal where they have been sitting in on interviews conducted by Portuguese officers.
More top news
Temperatures will be hottest in the west on Friday and in the east on Saturday
The MP had said the party had been "too apologetic" in its response to anti-Semitism allegations.
Officer Alex Kipp was on his way home from work when he responded to unusual reports of a juvenile driving on the wrong side of the road.