Brazilian President Luiz Inacio Lula da Silva asked United States President Donald Trump to lift the 40 percent additional trade tariff imposed by the US government on Brazilian imports, in a phone call on Monday.

The leaders spoke for 30 minutes. During the call, they exchanged phone numbers in order to maintain a direct line of contact, and President Lula reiterated his invitation for Trump to attend the upcoming climate summit in Belem, according to a statement from Lula’s office.

The apparently friendly call may signal a turnaround in relations between the two, which have been strained in recent months , experts say. It also follows Trump’s comment that he had “excellent chemistry” with his Brazilian counterpart after the two had a brief, unscheduled meeting and even exchanged a

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