Brown, who was the U.S. ambassador to New Zealand during Trump's first term, said he believes – despite the differences aired publicly on Friday – that Trump and Zelensky will ultimately come together and will strike a deal on the rare earth minerals, which was originally set to be signed at the White House but was scuttled after the dust up.

President Donald Trump says Ukrainian leader Volodymyr Zelenskyy has written to him to say he appreciates U.S. support for his country in its war with Russia and is ready to sign a deal that could ensure future American support.

ET Ukrainian President Volodymyr Zelensky called Friday’s meeting with President Trump “regrettable” in a bid to mend the relationship with the U.S. Photo: Ukrainian Presidential Press Service/Planet