Jim Yong Kim's resignation comes over 3 years before end of his term
He was appointed World Bank president by former US President Barack Obama
Mr Kim says he would share details about his new job later
Jim Yong Kim unexpectedly resigned as President of the World Bank Group
World Bank Group President Jim Yong Kim unexpectedly resigned on Monday, more than three years before his term ends in 2022, amid differences with the Trump administration over climate change and the need for more development resources.