Ms Halvorsen voiced support for a campaign of solidarity with the Palestinians, due to be launched by her Socialist Left party this month.
“It is a long time since I bought any Israeli products,” she told Norway’s Dagbladet newspaper.
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Norway’s foreign ministry said such a boycott was not government policy.
Ms Halvorsen insisted she was expressing her party’s view and not that of the government. She would not front the campaign, she added.