11.   His officially orchestrated rise has been buffeted by a leadership challenge by a banished uncle, Rifaat Assad.

12.   Instead of skulking off to lick his wounds, the New York congressman is quietly building his own power base for a potential leadership challenge.

13.   Jiang faces a difficult leadership challenge in trying to fulfill that pledge, and Hong Kong residents remain broadly skeptical.

14.   Moderate Republicans are also expected to be in ascendance, while conservatives are facing leadership challenges.

15.   Protecting another generation of young people from premature illness and death is the greatest leadership challenge for many countries.

16.   The British and Irish governments were relieved that Trimble had survived the latest leadership challenge, but divided on the wisdom of his gambit.

17.   The level of discontent with Gingrich is difficult to gauge because few lawmakers want to be publicly associated with a leadership challenge that could easily fizzle.

18.   Prime Minister Benjamin Netanyahu faced a leadership challenge by his former political mentor Monday, a day after being branded untrustworthy by his outgoing defense minister.

19.   Prime Minister Benjamin Netanyahu faced a leadership challenge from his former political mentor Monday, a day after being branded untrustworthy by his outgoing defense minister.

20.   Bolger agreed to stand down when it became clear he would lose a planned leadership challenge.