Two Swiss lawmakers have asked the country's attorney general to probe the legality of gifts reportedly given to US President Donald Trump by Swiss business leaders days before the two nations cut a breakthrough tariff deal.

A delegation went to Washington earlier this month to try to persuade Trump to lower his 39-percent duties on Swiss goods -- among the highest in his global tariff blitz.

A Rolex table clock and an engraved gold bar later appeared on the president's desk.

When Washington and Bern struck a deal slashing tariffs on Swiss goods to 15 percent 10 days later, criticism of what has been dubbed "gold bar diplomacy" resurfaced.

"We believe that the events in question deserve judicial clarification," said Green MPs Raphael Mahaim and Greta Gysin in a criminal complaint to th

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