Original: On 4 June 2010, he was designated by his party to succeed Christian Wulff as Minister-President of Lower Saxony, if the latter was to be elected President of Germany on 30 June.
Simplified: On 4 June 2010, he was chosen by his party to follow Christian Wulff as Minister-President of Lower Saxony, if the latter was to be elected President of Germany on 30 June.