UK Prime Minister Theresa May's own MPs will vote later on whether to remove her as leader of the Conservative Party.
The confidence vote will take place (1800 - 2000GMT) after the threshold was reached of Conservative lawmakers who've written letters calling for her to go.
Mrs May's faced criticism from many in her own party over her Brexit deal - and for pulling a parliamentary vote on it due for Tuesday.
UK correspondent Olly Barratt reports.
IN: "We have...
OUT: ....Brexit deal."
DUR: 45 seconds
ALT:
UK correspondent Olly Barratt says it's difficult to predict whether Theresa May can come through the leadership challenge.
IN: "The pulling...
OUT: ....to call."
DUR: 63 seconds
ALT:
UK correspondent Olly Barratt says it complicates the Brexit process.
IN: "If Theresa...
OUT: ...more time."
DUR: 55 seconds