Warsaw: Mitt Romney's aide on Tuesday added a fresh incident to the Republican White House contender's growing list of gaffes, telling journalists to "kiss my ass" as they chased the candidate for answers.

Romney's spokesman Rick Gorka lost his cool when journalists pressed Romney, who was visiting a war memorial in Warsaw, over the embarrassments that have plagued him during a tour that has also taken him to London and Jerusalem.

Gorka also told a reporter to "shove it", before calling journalists half an hour later to apologise.

Gaffes have dogged Romney ahead of the November 6 Presidential election.

In Britain, Romney -- who ran the 2002 Winter Olympics in Salt Lake City -- ruffled feathers by questioning the security readiness for the London games.

In Israel he backed Israel's right to thwart Iran's nuclear ambitions, but drew fire from the Palestinians for endorsing Jerusalem as the capital of the Jewish state.

(Agencies)

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